My high e string keeps breaking right over top of the little roller bearing type part in the tremolo. It definitely has a groove in it and I'm wondering if there's a way to turn it. It looks like it just sits in there and should be able to be turned, but I can't get a grip on it and it doesn't seem to want to move. Aside from getting a very tiny file to file it smooth, what can I do? I just got this back in February, so I'm surprised I already wore a groove in it.