I'm pissed and frustrated about my Full Circle pickup. This is the second one that's broken and I think I'm giving up on it. You know how the tone changes as you turn the wheel and repeats every quarter turn? So, to get the same tone but raise or lower the bridge you have to go a quarter turn at a time. I've done this a few times, not being rough with it or anything, just experimenting with heights when I change strings or whatever. After a while the first time it shorted out completely; then I got my luthier to get me a replacement; now this one makes a loud farting noise everytime I play a note, no matter where the wheel is set. I really liked the pickup when it worked but they seem not to be very durable. Back to old faithful, Mr. Underwood! Anyone else have problems with these?