I have been attempting to dial in my one month old BTB 515. I think the bad tone I am now experiencing may be due to lowering the action too close to the pickups. Here comes the dumb question: It looks like the pickups are covered, and that any height adjustments are made with them off. However, the two screws could be to adjust pickup height, and I don't want to end up with pickups floating around in the cavity. Can someone confirm that the screws are indeed used only to hold the pickup covers on? Thanks for your patience.