Hello, Guys . Thanks for all of the replies. I checked my stash of old thumb screws, not a 12-24 in there. I found a source to buy their minimum of 25 pieces, I will keep looking. I was able to come up with a 12-24 wing nut & set screw, will try an epoxy weld on the threads. Btw, I found two more of the handles, with clamps, yesterday, at the flea. Lewill2 , I like that that style thumb screw!!!!!!! Thanks again, Lou