"Jim Wilkins" wrote in message
...
...
They were print head hammer pads for a Teletype ASR33, little buttons that
snap over a steel mushroom on the hammer. The ink solvent slowly turns
them to mush....
jsw

Here is a real one:
http://bytecollector.com/images/2008...letype_005.jpg
Mine lacked the rim and were harder to pry off.

The rubber didn't last as long as factory ones, partly because I re-inked
old ribbons with stamp pad ink, but since I could pop them out as needed, it
didn't have to.

jsw