No advice here? :-(didn't wanna start a new thread on the same topic... so I'll just post a reply here....
My RG520 has had increasing play in the trem arm socket lately (Edge trem). I was almost certain it was the arm socket nut that needed to be tightened, and surely enough, it did have room to tighten (when I finally tried it last night). However, there is STILL fair amount (maybe same amount) of play in there. I also thought it could be the arm bushings and whatnot, but when I swap it with the arm from my JPM, it has the same play in RG, while the RG arm, when placed in JPM trem, works without any play (or at least the same as the JPM arm in JPM). So except being slightly looser (not talking about play, just regular loose vs. stiff arm movement), the RG arm behaves more or less the same as the JPM arm, regardless of which guitar you throw it in... So, my guess is that the arm itself is fine.
I'm pretty sure that the socket has been tightened as much as it will go... Is it possible that the socket has just gotten enough abuse over the years (almost 10), and can't be tightened???
I knew about the nail polish trick... but I thought that's only when you want the arm tighter so it doesn't move on its own... I didn't think that it would fix any "play" like this... Well, it turns out, it DID!!!! The arm is now nice and tight, AND it doesn't move on its own (which I have to get used to, because I always played with a loose trem arm, but this is better than the clunky play in the socket). I guess I'll see how long it'll last before I have to put some more polish.I'd try the home remedy tricks, such as nail polish in the bushing cut-outs (in the trem arm, take bushings out first) or inserting the arm with some thin plastic around the end.