I've bashed my Jazz Bass on the headstock, and the damage is a small chunk of wood chipped off on the very top, and the single tuner on the bottom side caught the force and snapped off the paddle. The impact started at the top, then slid down until it hit the tuning paddle. The sharp edge of a brick wall! It didn't even go out of tune. I can fix the chunk temporarily until at some stage I get it repaired properly, and I've ordered a new machine head. My question is that the G is still at pitch so I can't just take out the 4 screws because it will probably suddenly spin and damage the guitar even more. I don't want to cut the string - as it's nearly new, so is there a non-damaging way to take the tension off?