Here is a fun thing I learned today about Prentiss vises. Basically the main nut from a 5" Prentiss will fit a swivel jaw Model 21 or a Bulldog 265. The Bulldog main nut has 21 cast right in it. If UPS hadn't lost the dynamic jaw of my Model 21, I could tell you if the lead screw would swap over too as far as length. The other nut in the photo is from a Model 22.
Craig
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Its hard to believe that those threaded main nuts have not seen the light of day since they were assembled 100 years ago. The last fingers that probably handled those pieces were the assemblers at the factory maybe even before WWI Guys, your looking at some serious vise history here! Yeah, the chimmeys were all smoking back then and that was before Industrialization moved West. Those are non replaceable relics!
