[Unclenick]

Geezerbiker,

If it is 3/16 out of round, you can use a drafting compass to find its center and then drill or Dremel out the extra material out until you have an oversized but centered hole. Find some tubing or pipe that has a wall that thick and that fits over your shaft closely (you may need to add some shim stock to get a close fit). PVC tubing should be fine. Cut the pipe a little shorter than the thickness of the wheel so it doesn't interfere with the washers that clamp it down. Stick the pipe in the middle.