I picked up a used Record vise and disassembled it to clean out years of hardened grease and sawdust. Now I can't get enough preload on the clutch spring to reliably engage the half nut. I've heard it's a difficult process but no one explains how to do it. Right now it's difficult to use and wouldn't think of trying to hold a piece to route.
I can remember how difficult that was. I ended up making a kind of lasso out of rope and putting it around the vice, then pulling it gradually tighter while starting the threads into the nut. There was no one around to help, so I used a clamp attached to the bench to tie the rope to and hold the rope tight between tightening adjustments, which required several tries before success. It ain't easy!!!