Warwick's adjustable nut is different from ours, is it not?
I'm not exactly sure when we started installing them regularly, but I think it was 1982. At least that what the 5 minutes I was willing to spend on this today revealed.
added:
Well, I looked at the video, and these are not the just-a-nut type, they certainly do resemble our adjustable nut a good deal.
(Message edited by mica on February 22, 2013)