I'm totally new to these. Do I finish the threads on the screw and nut? My gut tells me a couple coats of a hardening oil like Watco, followed by some paste wax. But maybe that's not the best. Unfinished, they are a bit grippy.
Incidentally, I'm building a Roubo-style bench with these. I'm posting the progress to my blog (oudluthier at blogspot), if anyone is interested.