I was working on cleaning up everything I've got for my lathe and when I started on the 4 jaw chuck I noticed a chunk of one of the screws had been broken where the T handle connects to the screw. I've searched all over the place looking for replacements; new old stock at SearsPartsDirect.com, a used chuck on eBay and Lost Creek Machine, and searches on Google; I've come up empty handed. I've got the 101.21581 chuck and pickins are slim. Are other screws compatible? Am I better off looking for a different chuck? Or is there an option I've overlooked?