I was cleaning out all of my pen turning supplies and I found a tool kit from Berea it has screw driver bits in it. I do not have the tubes. The parts that go into the brass tube are .373-.375 diameter. Any help on where to find tubing to fit? The tool kit was 5808/TB-HP-1 The bushings were 5808/TL 10B which is probably for the B mandrel. It's amazing what you find when you are home and no place to go!!!