I'll have to say this is a first for me, and I have set up several guitars with Bigsby's, to the point where the spring almost falls out when pulling up, and the guitar will stay in tune. Tuning after using the Bigsby was dismal, it absolutely refused to stay in tune. So fast forward to tonight. I installed a TonePros roller bridge, locked the pins with the set screws, and began the multiple tunings to get everything evened out and to a steady tension. After 2-3 attempts, it was in tune, and will stay in tune unless I use the Bigsby. Even if I only push down on the arm, The G is sharp when I release the arm. Not a little. Almost off the chart on my DeltaLab clip on tuner. I have had strings stay flat from nut binding, but this is a new one for me. I tune all the strings, push down on the arm, and when I release, the G is way sharp. The bridge is not moving at all, so I am more than a little confused. When I had the strings off, the roller seemed to move freely. I have had many that would bind on the bushings (import Bigsby's) and needed the ends sanded a bit to free them up. I am ready to take the USA B5 off of another guitar and see what it it does. Yeah I know the holes don't line up perfectly, but I would drill and dowel the original holes to install the US B5 if it would end this issue. Any solutions? I have already decided to upgrade the tuners, though I know that is really not the issue here, or at least I think it's not.