[GreenKeys] platen refurbishing FYI

[Til128 at aol.com]

Hello all -

I'm having the platen on my M15 re-covered.  It was  rock hard, and the 
type bars were perforating the paper, even when I backed the  typing force 
adjustment as much as possible.  The guy doing the restoration  says that the 
platen currently measures a 100 Shore-A, which is the same as  "modern" (lol) 
Selectric typewriters.  He says older typewriters used a 90  Shore-A 
material, but claims that the softer material could allow perforation of  the paper 
and ribbon, which is exactly the problem I'm having now...   

Does anyone have an opinion on this?   

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Some measurements for Shore durometer "A"
 
Rubber band 25 A 
Door seal 55 A 
Automotive tire tread 70 A 
Soft  wheels of rollerskates and skateboard 78 A 
Hydraulic O-ring 70-90 A 
Hard  wheels of rollerskates and skateboard 98 A 
Ebonite Rubber 100 A 
 
TT
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