From: classiccmp at 
vintage-computer.com
 On Friday, December 24, 2010 12:15 PM steve shumaker wrote:
  does anyone have an actual measured diameter of
the pad available? 
 As near as I can measure they are 7/16ths of an inch (11mm) in diameter,
 3/16ths of an inch (5mm) tall. I don't have calipers so these are eyeball
 on a ruler measurements, but should be pretty close.
 I can do pictures if you want.
 Heck, if someone wants a few samples to try and reproduce I can do that too.
 Does anyone know anyone at Keytronics who might be able to swipe the
 original machining, specs, etc? Maybe someone high up we can talk into
 making a few tens of thousands more? :-)
 Heck, they owe the community for these problems and should do this by way of
 apology. Give me a good, last-a-century buckling spring keyboard over these
 mushboards any day!
  
Hi Erik
 I have some poly foam that is about 1/16 thick. Mayby stacking with
a little contact cemment would work well.
Dwight