[GreenKeys] TP180502 Head, Print Hammer

[Steve Schlink]

I would second the urethane suggestion, although maybe room temperature 
curing rather than thermoset injection molding. The mold cost would 
probably be a show stopper.

I recently had to replace a windshield on the car, and used a 3M product 
called Windo-Weld p/n 08609.

http://tinyurl.com/7asyrzv

This is the toughest air curing elastomer that I have ever used, easily by 
an order of magnitude.

It comes in a caulking tube, so I would think that it would be fairly easy 
to adapt to a primitive mold. One tube would probably yield about 100 
hammers pads.

It is also available for a marine application although I don't have a prod. 
number for it.

If I had to guesstimate, I would put the Shore A durometer at about 70, 
typical for most O-rings.

As a comparison, it is much harder & tougher than any polysiloxane 
(Silicone) that I have used.

But, since we don't even know the hardness of an original, it make take 
some trial & error.

Steve