Quote Originally Posted by Pugsley View Post
I have a couple pipes that were made for 9mm filters and would like to get adapters for them, but the only one I can find reduces it down to 3mm which is smaller than I'd like. Does anyone know what the best material would be to make one from? Wood is out because I'm afraid it may swell if it gets damp and damage the shank. What about lucite or vulcanite? Any suggestions?
I've used alumina ceramic. Fireproof, non porous and pretty tough. You have to cut it with diamond tools though.

http://www.mcmaster.com/#ceramic-tubing/=wnyvvb