Keytronics foam fix?

[elecplus]

Posted from another mail list I belong to:

I've fixed a couple of keyboards using hobby shop track bed foam, but have not been very happy with the "feel". That foam is considerably less resilient than the material Keytronics used. After trying a number of alternate materials, I have found something that is almost identical to the original. Take a look at eBay #171549720453 for an example.

It's 5mm thick with an adhesive backing, sold for shoe inserts. I stuck 0.075" plastic sheet to the backing, then turned it over and used spray adhesive for the aluminized mylar. Worked like a charm. Just finished resurrecting a N* Advantage and the typing feel is (in my opinion) far better than the last unit I did with track-bed foam (Corvus Concept).

[Findecanor]

Thanks for sharing.

To save for posterity:

Podopro Polyfoam 5mm
45cmx22.5cm
4 sheets
Comfortable, soft, open cell polyurethane foam with highly compressible with instantaneous recovery and ideal for light cushioning.

• comfortable, soft, open cell polyurethane foam
• highly compressible with instantaneous recovery
• ideal for light cushioning

The foam in the eBay auction even looks a bit like the foam used by Key Tronic.

original:

ktfoamandfoil.jpg (61.58 KiB) Viewed 961 times

I wonder, is the thickness of 5 mm correct? (I gave my discs to another member, so I have nothing left to compare against)