About restoring capacitance-keyswitch keyboards, including source materials, and work by several former-MARCH members: http://www.retrotechnology.com/restore/sol_keys.html Metalized Mylar in rolls may be available at "dollar stores" as gift-wrapping. It's just aluminum on Mylar. Snack chip bags, cookie bags as noted, helium balloons, gift wrap - on and on. the challenge is the right "foam" material. Bill Degnan came up with a good material - see my Web site, and his. Herb -- Herbert R. Johnson, New Jersey USA http://www.retrotechnology.com OR .net