I entered this previously but I think it used the wrong forum. I have a Tucker Vice that I purchased new in the 90s. It has worked great however recently I'm not able to tighten the vice enough to hold anything. As soon as there's any resistance the screw slips. The the quick release seems to work fine but when I am closing the vice and tightening the quick release mechanism activates disengaging the screw and the vice won't tighten. It just slips. I replaced the return spring and have lubricated moving surfaces with WD-40 dry lube but am not having any success. I am going to look for a stronger spring but the one that came with the vice has worked fine. I was able to get a replacement from Veritas and it made no difference. Any help would be appreciated.