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Do not shellac the gear into the step chuck. If you use the shelllac, chuck a piece of brass rod large enough to hold the gear into the lathe. Then take a face cut with your cross slide to get a perpendicular surface to the spindle. Then without removing the brass rod heat it with a clean flame (cigarlette lighter). When it is hot enought to melt the shellac spread it across the surface of the brass rod. Then push the gear onto the rod and squish it around until the flat gear surface is flat against the brass rod. When the shellac cools down a little run the lathe fairly slowly and center the gear in with a small stick. When the rod cools down and the shellac hardens, the gear will be attached and centered. If you go to Youtube there is a Steffan Pahlow video demonstrating this.