I've got a Craftsman 4 jaw, 8" chuck that has a broken adjustment screw for one of the jaws. I've received some good tips on how what to do about making a new one since I can't find a source for a replacement screw or donor chuck. My issue is getting the plug out that holds the screw in, and specifically how to get it out. I've tried using a drift pin/punch to try to get the plug out but it wouldn't move. The one plug was flush with the back of the chuck and the others were slightly pushed in so I tapped the back of the plug with a small hammer and it became pushed in like the others so I know it's not frozen in place. I'm stumped as to how to get it out. I also figure I should take out all the screws and really clean the chuck, there are some chips and grime in the recesses. 1 image is the rear of the chuck where the plug was pushed in, the other image is the front of the chuck showing 1 of the 2 fingers on the plug that keeps the screw in.