I feel like this has happened to me several times, and I never see anyone else mention it. Once in a long while, I will remove all strings for a thorough cleanup. When I get it all done, and get strings back on, the Bigsby arm seems to be sitting higher (further from the strings). I don't think I'm crazy (based solely on this) because when I swing the arm back to put the guitar in its case, the arm touches where it did not before. The spring appears to be properly in place. Is there some trick I'm missing??