Did you try putting a small dab of vasaline on each pivot point?If I dive bomb each string goes a few cents down(still in tune with each other).so if I hit a cord it sounds perfect but on a tuner I’m down a little. Once I pull it back a little all strings are right back in perfect tune.
There’s no string stretching or anything off. It’s in tune. Just not at the key I tuned to. Once I pull up so slightly it’s in the right key again. The whole baseplate does not return to home position. It’s definitely binding The knife edge is junk It’s pot metal and not hardened like an ofr