"He who marches out of step hears another drum." ~ Ken Kesey
If I recall correctly, the studs were permenantly welded to the tubes, and the lock washer and nut and stud, all were stainless on my frames. If you get them in good condition and cheap, it would be a nice score.Personally I've gone away from rollers entirely, but that's a book of reasons I don't have time to write, besides, I don't want to start a "screen war".
be sure not to over work the nuts