couple of tricks. carefully mark the shaft where the set screws make contact and drill a shallow dimple. I started off using blue and red loctite on the set screws but have since gone to fingernail polish. i put it in the set screw hole and around the edge of the sprocket where it will wick in between the shaft and sprocket. to disassemble, a little heat from a propane torch does the trick. one issue i see is that you have a lot of unsupported shaft length , you really should add support bearing next to that sprocket on the end. you can also ad lock collars on either side of the sprocket.
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