Lovely Gretsch 6120 but the bridge moves a little when played with Gusto!Set the intonation correctly then marked out the bridge positionBridge removed but masking tape shoes the positionA strong double sided tape under the bridgeAll back together, customer needs to try this ut, If it still drifts it will need pining Nice Gretsch 6120 in. It has a bridge that will not stay still while “The Bad Detectives” play their tunes… Also end pin unscrews from the body. Both issues fixed.