I recently picked up a used Schecter Revenger 7, and it seems like it goes out of tune a little faster than my other axe (Hellraiser C7). I swapped out the pickups and had it professionally set up by the same guy who does my other guitars, so I don't think it's how they're strung or anything like that. What are some things I can check to diagnose the issue?
Basically I'm wondering if picking up a set of locking tuners would help, or if maybe I need a new nut or something. How would I go about determining which? Also, I'm not really seeing much in the way of tuner sets for 7 strings, so I'm assuming I'd have to call up sperzel or gotoh and custom order them?