I've been looking at Stratocasters recently and trying them out to see what I like. I've noticed more than once they've had some trouble coming back to tune after a wiggle of the vibrato. Not Hendrix level abuse, just a wiggle to emulate a Bigsby if you're familiar with that type of vibrato. I'm assuming binding at the nut is a possibility, as well as old strings, and the springs in these really don't fight back much at all. But I'd heard recently that it could be the wraps of string around the post coming loose and then tightening again, and thus locking tuners would be a good idea. I've never heard that one before. I used to have an American Special way back when, and with that I popped all five springs on, decked the trem, and pencilled the nut slots and didn't have much of an issue. Do locking tuners really make a difference in tuning stability?