Well, I stripped the vice and reversed the hal-nut saddle this morning. It has helped, but the thing still slips, just less quickly. The only way that I can stop this from happening is to remove the quick release mechanism, stack washers on the half-nut spigot and bolt the saddle back on over it. This restrains the half-nut and the vice now holds, albeit without the quick release.
Puzzled.
James
Puzzled.
James



