When the compression lock is released on my new PM 2 it feels kind of sticky and makes a little scratching noise. I'm wondering what I can do to remedy that. It works OK, but the noise and resistance are irritating. I'd prefer not to take the knife apart if possible. I'm thinking that maybe there is a burr on the compression lock tab that is causing this but perhaps it is something else. I suppose I could send it back to Spyderco. Any suggestions?