Long story short : I need a good solid semiconductor material besides pencil lead I can't find any potentiometers that I can insert my own shaft into so I decided to try to make my own. The shaft is about 0.25" in diameter so it's not something big. Anyways, I know I can use pencil lead as a semiconductor to make a potentiometer but I get the feeling the device will eventually wipe off the material. I need a good solid semiconductor, maybe something I can cut with scissors? Thanks in advance.