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The SlipSlider - a Revolutionary Harmonica

In July 2018 the SlipSlider Mk2 was released, made from the classic Hohner Special 20 harp. It has many improvements over the Mk1:
  1. Consistent and comfortable mouthpiece due to the lipped comb.
  2. Low pressure required to move the lower drawplate/coverplate.
  3. No need for grip pads on the coverplates.
  4. More bends! 7 draw will now bend (impossible on the Mk 1).
  5. Bigger extra bends! In addition to the new high draw bends and low blow bends, you also get huge high blow and low draw bends. These can all be bent to in-between notes for great expression.
  6. Top and bottom coverplates can be instantly removed to work on the reeds for fine tuning, gapping etc.
The SLIP-SLIDER HARMONICA Mk2 - Easier to Use, More Bends, Lower Price!
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To understand the basic concept behind the SlipSlider, go to the How it Works tab. To see/hear more useful examples showing the cool new bends, check out the videos relating to the Mk1 SlipSlider - all the main new bends are the same.


Up till now, the SlipSlider Mk2 has been only available as a bespoke custom harp, hand-made by Brendan. He worked out and refined the process over a period of years. He now feels his method is simple enough to be followed by anyone with decent mechanical skills, to make their own SlipSlider! To assist, he's made a detailed video showing the whole process from beginning to end, with running commentary and helpful annotations. If you're interested in owning a SlipSlider, please watch the video first.

There are now two ordering options for the Special 20 SlipSlider:

  1. DO IT YOURSELF (DIY) – If you are handy with tools and believe you can follow the steps in the video, great! Simply order the PowerParts Kit and get to it. BUT – the onus is on you to do the job well. We will not be responsible for any problems or failures. However, we will offer support if needed (see below).

  2. RECOMMENDED CUSTOMISER – If you don't feel confident to make your own SlipSlider, it can be made for you by some of the best in the business. Below is a bunch of very talented, experienced harp techs, who are ready and waiting to make your SlipSlider! In addition to the basic job, they can add cool extra features (eg. slot embossing, flattened backs to the covers, alternate tunings etc etc).

    If you choose to get your SlipSlider made by one of our Recommended Customisers, you don't pay us anything. Nor is there any need to contact us – just go straight to your chosen RC and deal directly with him to choose your harp key and any special features you desire.


    The SlipSlider PowerParts Kit contains all the necessary bits and pieces in one handy pack. The price includes the parts, international postage, and an IP/Support charge. This is to recompense Brendan for his work in developing the SlipSlider using magnets, dating back to the SlipSlider Mk1, refining the SlipSlider making process, and sharing his knowledge in the detailed video. He is also ready to offer support for anyone who gets stuck (included in the price).

    1. DIY PRICE for PARTS KIT ONLY - £25
      If you already own a Special 20, this is all you'll pay to utterly transform it into an amazing all-bending harp, which will give you truckloads of expressive new possibilities!

      This includes a new Special 20 harp in the key of your choice, the SlipSlider Parts Kit, and of course the knowledge your SlipSlider will be made by a highly skilled harmonica customiser. It's a price they have all agreed for the standard conversion using the stock harp, and you will pay them directly for the whole package. If you want upgraded features (embossing, alternate tunings etc), each of the Recommended Customisers has his own specialities, and will let you know the extra charges for them.

    (*£120 is the agreed basic Recommended Customiser price for the SlipSlider Stock Conversion (no extra work), but due to the different government tax policies of the various countries the RC guys reside in, there might be small adjustments necessary – they can explain that when you get in touch with them).


Joel Andersson
Sweden customiser

Based in Sweden, Joel makes fabulous custom chromatics and diatonics.

Kan Osumi
Japan customiser

Kan is a very creative, enthusiastic harmonica customiser from Japan.

Andre Coelho
Portugal customiser

A Brazilian living in Portugal, Andre does excellent harmonica custom work.

John Cook
UK customiser

A brilliant UK engineer / machinist, John repairs harmonicas and creates his own from scratch!

George Miklas
USA customiser

Well-known USA harmonica repairer/customiser.
All prices include international shipping.
For full details see our Terms & Conditions

Mk2 SlipSlider PowerParts Kit

For DIY option

(Harmonica not included)


(Discount applied for five or more)


Slip Slider PowerParts

Tuning Diagram

Slip Slider tuning diagram
Inbox Notes

Disassembly and Tech Tips

Understanding the Concept

The stock Richter diatonic harp is a very expressive instrument, but it has some limitations. The main one is that only 8 of the 20 reeds can be bent in pitch: holes 1,2,3,4,6 draw, and 8,9,10 blow. That's because these are the only holes where the blow and draw notes are a tone or more apart, allowing for an interactive-reed bend between them. The high reed in each hole will bend, but the low one won't - because it doesn't have a lower-pitched reed to bend down to. But what if you could somehow move reeds around so that the non-bending reeds were in the same airstream as a lower reed, thus allowing them to bend? That's the concept behind the patent-pending SlipSlider harmonica.

It's made in two separate parts: the blow reedplate and comb are fixed, while the draw reedplate can slide left and right. The two halves of the harp are held together with magnets, which hold them in the neutral position for normal play. But when you want the extra bend notes, you just slide the draw reedplate a few millimetres to left or right with a small adjustment of your grip. When you release your grip the drawplate snaps back to the standard home position.

Slide to the right, and hey presto: you can bend the lower blow notes! 2, 5, 6 and 7 blow are suddenly juicily bendable. Slide to the left, and now you can bend your high draw notes! 7, 8 and 10 draw now bend like 3, 4 and 6 draw. In fact, you can play the top octave in exactly the same way as the middle octave. Just transfer your favourite middle-octave licks up there with identical bends and breathing patterns - so easy, and so expressive! Release your grip and the magnets snap the draw plate back to the middle position, for normal harp play with overblows and all the stuff you're used to.

I released the first SlipSlider in April 2018. The Mk1 was a revolutionary harp that proved the principle and worked well - but it was very complicated to make with many bespoke parts, and therefore quite expensive. The Mk1 SlipSlider has now been discontinued - but if you have time check it out, it's an interesting harp! The current model, Mk2 SlipSlider is made from the Hohner Special 20. It's easier to play, simpler to make, plus has more bends - and a lower price!


It turns out the concept of sliding reedplates in a harmonica goes back at least to 1892, when a patent was issued to one Franz Jacob for a tremolo-type harmonica that used it to achieve extra chords. There was another patent along similar lines from Rheinhold Friedel in 1925 - but nothing came of these early designs, and the idea fell into obscurity. The application of sliding the draw reedplate on 10-hole diatonic harps for extra note bending was invented by my good friend Zombor Kovacs, a clever harmonica-playing engineer from Budapest, Hungary. He made a prototype in 2006 that worked, but not well enough for his liking. Here are some photos:
Slip Slider Prototype Slip Slider Prototype Slip Slider Prototype Slip Slider Prototype Slip Slider Prototype Slip Slider Prototype
In 2017, with Zombor's blessing, I decided to re-examine this idea and see if it could be improved. My Mk1 SlipSlider had many innovations: the main one being the use of magnets, to hold and locate the parts together. My improved Mk2 SlipSlider retains the use of magnets, but is otherwise closer to Zombor's original concept. (Thanks also to Canadian Paul Bowering who, inspired by Zombor's and my models, made his own one from a Hohner Special 20. Inspired in turn by Paul's one, I adapted and refined the making process to create my SlipSlider Mk2).


" The SlipSlider is a genius innovation by harmonica guru Brendan Power. Built around the classic Hohner Special 20, it has a sliding reed plate that allows for many additional blowbends and drawbends. This means it's a fully chromatic instrument, but more importantly, it gives you way more soulful bending options when playing blues or country music. No longer do you have to cross harp to play blues. There are some wonderful first position capabilities, as I demonstrate in this video. All the normal playing techniques you're used to on a standard Richter harp are preserved. "

Rory Hoffman, USA

Daniel Cousin, USA
" I'm in love with the Special 20 Slip Slider. It really does do everything, and in many instances eliminates the need to overblow or overdraw. I also found some interesting uses for the crazy draw bends. The best part is, it sounds and plays like a normal Richter harp, plus overbends, which is something no other specialty harp can claim as far as I know. Single reed blow bends may also be achieved by sliding partially, which comes in especially handy for bending 4 blow. Its extra bendability makes this an ideal harp for rock tunes, allowing one to really wail on the 6 and 7 blow notes. In the harmonica world, if folks realize the Slip Slider's capabilities, this could be the equivalent of what the invention of the electric guitar was to guitar players. It's that good! I still see a need for standard harps, and will definitely continue using overblows and overdraws for speed runs and licks, but I'm going to be incorporating more Slip Sliders into my playing, especially for melodies. I'm having lots of fun playing accompaniment now as well. The country players would be crazy not to use this harp on recording sessions. There are so many things that open up with the extra bends, and they sound very good and normal, if that makes sense. In other words, they have that same characteristic interactive bend sound one would expect from a draw bend. Overall, this is a killer harp and extremely friendly for melody playing.

Finally, we have a harp that gives us everything we could possibly need, while not compromising the classic playability and sound of a standard harp which we all love. My family and friends keep saying, 'will you please put that harmonica away!' "

Todd Parrott, North Carolina USA (July 2018)
Check out Todd's brilliant playing on his CD "Songs From the Harp", and info on his popular harmonica workshops, session playing etc at his website.

" The S20 SlipSliders are just so much fun to play. I'm totally sold on the magnetic cover attachment, BTW. The S20 had a draw reeds that was gapped a little too closely for me, so I popped off the cover, lifted the reed with a fingernail and stuck the cover back on. The whole thing took just a few seconds. I've already started wondering how practical it would be to redo my main diatonics like this!

Something else I noticed - with the draw reeds shifted to the left on the S20, what was the 5 overblow (now in hole 4) becomes much easier. Hardly an essential feature, but I suppose there might be a situation where one might prefer the overblow to the hole 6 blow bend. "

Pat Missin, UK/USA (July 2018)
Make sure to check out Pat's amazing website, hands down the best harmonica resource on the internet:


" The harmonica plays like a dream, I was a bit concerned about the air tightness when I first see the concept, but in action, I can overblow 456 and overdraw 789 out of the box, 10 is a bit squealing but I think that's just my technique. This is WAY better than the OOTB crossovers I've had in the past, so the air tightness is definitely not an issue.

In terms of the notes, from my little experience with it, I can now play the b3 in the lower octave which I wasn't able to get with OB, and I can get the same juicy bending trill between the major 7 and root as the PowerBender running in the middle octave when playing 2nd, much stronger than using OB, and much more musical and tonally pleasant.

It is totally a game changer for sure. "

Wenchao Li (May 2018)

" I purchased a SlipSlider Crossover in G a bit ago and have been digging it... Took a bit of time to figure out a method to prevent slipping fingers but in the end I came up with a nice grip system using a few brass finishing washers and a spot of hot glue; it works well and looks great. ... I really appreciate your ingenuity! "

Harp, from Brendan's Forum (May 2018)
" I finally put my SlipSlider together. This is fun. I haven't done much with it yet, just noodled around, and haven't decided yet how I'm going to do the grip modifications, if any. With Thunderbird covers it does pretty well, maybe just a small dab or two of clear E6000 glue on each side will do the trick. In C having the blowbent Eb and Ab available is going to be nice. The ease of disassembly for cleaning and adjusting alone is a great plus. If it works as well in the Lucky 13 regular breath direction models my other harmonicas are going to get dusty. "

CrawfordEs, from Brendan's Forum (May 2018)

Mark 1 SLIP-SLIDER (Now Discontinued)

The initial development of the SlipSlider was to fit the excellent Hohner Marine Band Deluxe and Crossover harps. All the design and testing work was done for the Hohner version, and they feature on the first videos. As you can hear from them, the Hohner harps come out sounding very good in SlipSlider format, even without any reed gapping or slot embossing. When those refinements are added they sound very close to customised standard Hohners, with enhanced overblow performance as well as all the fantastic extra bending expression the SlipSlider gives.

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  1. Home Position - plays exactly like a normal harp
  2.  Right-Shift of Drawplate - Gives new blow bends in the bottom two octaves, top octave stays the same.
  3. Left-Shift of Drawplate - Gives new draw bends in the top octave, lower two octaves stay the same.
Check out the videos to hear it in action. The essential new bending ability is the same as the current SlipSlider Mk2, but it adds even more new bends!

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