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I don't think I'll have room for pop can shims. It's only loose enough to slide side to side, no wobble, but once I get the bolt off the end of the crank (bolt's currently stuck....) and get everything apart I'll give it a try. I had a couple of more intensive ideas. I was thinking about drilling and tapping a 7/16, 3/8, or 1/2 hole for a set screw in the driver gear. Possibly two set screws 30 degrees apart. I would think between the pressure of the set screw and the increased friction and pressure on the side opposite the set screws would keep it from sliding. Another idea I had would be to take the big washer that's on the end of the crank shaft and replace it with a larger diameter disk cut to be the same diameter as the spline valleys of the drive gear. Drill 3 or 4 holes, 7/16 or 3/8 in diameter, and drill and tap matching holes 1 1/2 to 2 inches deep in the clutch drive gear. Also drill the hole for the crank bolt in the middle of the new disk. Put the drive gear back on the crank. Bolt the new disk to the drive gear, and install the bolt that goes in the end of the crank. I would think this would bolt everything tightly together. As you can see my ideas aren't too simple so I know I'm probably missing something easier. Thanks for the responses.
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