"John wants the neck as flat as possible. What I do is I use the little StewMac String Action Gauge. I set the action on the guitars, I start at 40-thousands of an inch off the twelfth fret. So from the top of the twelfth fret to the bottom of the low string is 40 thousands and then adjust to the radius from there. It's very specific, we kind of equate it to a Formula One race car driver, and the guitar and the amp, rig and everything is the car and I'm the mechanic. If I don't set the car up right, he's not going to feel quite right. I'm doing truss rod adjustments sometimes right up until I hand him the guitar. We used to do it sometimes while he was playing but we try to get away from that now. So it's all kind of nit-picky stuff, but the end result is that he's able to out here and play two hours the way he does," says John Petrucci's guitar tech.more
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