The rubber foam I'm working with is a very tough closed cell structure, not
like styrofoam, the common urethanes, vinyls and such.
I sectioned one using a new box cutter blade, about the sharpest blade you
can find these days. It was almost impossible to move it through smoothly
without lubrication. A soap solution was used and I got the smooth surface
I need. But with the hole saw it didn't keep the teeth from grabbing
despite reversing the rotation. So I will try to sharpen some 3/4 copper
pipe as I mentioned unless I can find a 1" cork borer.
You can see the texture at
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