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Highly stressed parts will often have two grub screws down the same hole, the second one in locking the first like lock nuts. Often confuses people on dismantling . . . 'why can't I pull it off, I've removed the grub screw ' ... Andrew
If You think 2 setscrews in one hole are a pain, just wait until someone brings in a rush job pulley to be rebored and leaves one in the hole.
Did I mention I hate set screws? If you ever get a chance to use these....go for it.http://www.fennerdrives.com/trantorque/Dave