I defretted my bass, was getting all ready to string it up, and I started. The E goes fine and perfectly in tune, as does the D. But the A and G strings would NOT tune up, and then the tuners...gave out. They don't work anymore, I'm guessing they're stripped. I can't see how I did something wrong since it worked on two other strings, but I'm curious, does this happen? I've since got a fretless Corvette, and if I restring it with some Rotosound 77's, I don't want the same scenario happening.