I too need some rollers, in a past life we had a company making rubber
rollers for us, they would mould the rubber on (neoprene iirc) and
then freeze then grind
I am told that for most 'rubbers' you want to keep it at about the
temperature of dry ice (solid CO_2). At that temperature it can be
machinedrelatively easiy. Any colder, and it behaves like glass.
I don't have a soruve of suitable rubber compoind though. There are the
omes made by Devcon, but they are not cheap (particularly not if you
follow the instructions and mix the entire pack at one time!) I would
also have to make a suitable mould, but I think that is possible.
-tony