DIYbanter - View Single Post - Audio cassette pinch roller

Jim Land

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:

Alternatively, has anyone successfully machined down a larger
size (e.g. 13mm) on a lathe? My gut feeling is that rubber
is unlikely to machine down smoothly, though I've not tried.

The way to reduce the diameter of a rubber cylinder is to chuck in in a
lathe or electric drill, start it turning and bring a block with sandpaper
up to it. You abrade the rubber away, the same way you file your
fingernails.