i have a very cheap homemade lathe setup i made from a dremel shoeshine motor and a rest just for doing my own tips and cleaning shafts. Well I have always been fine until a few days ago, I put on a tip that was @ 15mm on my 12mm shaft, I had to sand it down a lot to get flush, well I guess I overheated the ferrule because it now has a very rough feel and there is some discoloration as if some sanded material got into it as it was cooling. i tried to sand it down smooth but it wont and I do not want to sand it too small, it also has a very slight bellish shape now, not perfectly flat. Tip went on fine and shaft and tip play perfectly, but, I think i am going to have ferrule replaced, but what kind of ferrule does this ? i guess it is an abs plastic of some sort. what ferrule should i get that will not do this , ivorine ? juma ? ivor-x ? micarta ? more i dont know names of. I do not want the expense of an ivory ferrule, help me guys....