I've done a lot of them. I think that I do them differently than most because I don't form the clay around the tube and bake it. I roll a sausage of the clay, bake it, then drill it for the tube. I use epoxy to hold the tube. Then I turn it shy of the bushings and cast it in Alumilite. I tried a few using CA, but they didn't hold up to day to day use. No problems with the alumilite ones.