[GreenKeys] Making missing rubber parts

[Jones, Douglas W]

I have a Flexowriter that is missing one of its rubber feet -- and a second foot is half-missing.  While I'd love to get an original Singer/Friden rubber foot, I have two feet from which I could make a mould (using, for example, clay or dental plaster), in which I could cast a replacement.  Has anyone tried this?  There are seem to be several alternatives:

-- http://versimold.com/
  a putty-like glob of thermo-setting silicone rubber you can form into the shape you want (by hand for coarse parts, or in a mould for more precision).  They suggest using hot air guns or ovens to cure it.

-- http://www.oringsusa.com/html/make_rubber_parts.html
  two-part pourable silicone rubbers that you pour into a mould.  You get a choice of soft or medium firmness.

I'd appreciate any experience anyone has with these kinds of materials.

		Doug Jones
		jones at cs.uiowa.edu