[jwhotrod]

the long setscrews are there because the manufacturer did not know what application they were to be used for. That said, those are standard cup point set screws and you can find shorter ones at any good hardware store it is a good practice, to put them together as you have to mark the shaft where they make contact. Then take it apart drill a drill point or shallow hole which is enough to keep the shaft from pulling out, use either the jam nut provided or blue loctite the screws and proceed.