Originally Posted by ZenSilk
It's very, very, very rough on the inside, like, mountainous. I suppose you could smooth it out, but that would take a lot of work and the perfect tools.
What would be easier is soldering a center stem down the middle. It would make the pull tighter, but make cleaning so easy.
sleeving it would be hard though to seal it up.
a hone or even getting a split mandrel and using really rough abrasive paper with a flex shaft tool would knock it down, i bet you could get it close to polish in about an hour