Has anyone seen

Re: Has anyone seen

it's a lever to clamp the nut lock.... so you don't need allen keys... Yamaha has it on a few models
 
Re: Has anyone seen

I can't quite figure out how that one works, but I have seen a strange locking nut system with the locking mechanism sitting off to the side like that. The page you linked to mentions a quick-change trem system, meaning its probably what I mentioned, a way of unlocking the entire locking nut instead of 3 locks like normal locking nuts have.
 
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