That’s exactly what I need. I am going to check out the local scrap yard and see what junk they have. I have a timing belt from an old sunbeam lawnmower it will handle 3 hp. It is a little long where the gears will be about 4" apart. I would like them 3" apart. I know I will need a lathe to set the bearings in the tube, and a collar on the bolt or axel that attaches the cog and the hub so they won’t be pressed against the tube. I thought everything will be balanced if it was either store bought or turned on a lathe?