I'll admit that I have no experience as a drum tech, especially for a top name act like The Police, but I always sort of assumed that bands carried extra drums for just this kind of situation. Maybe it's just extra snare drums, like when Stewart popped his snare head on live TV and Jeff was there to switch it out. I guess it would take up too much room to haul around an extra bass drum. I do remember an interview in DownBeat magazine where Jeff explained how often he changed snare and tom heads, and that he "rotated" the bass drum head so that the beater would impact a different spot each night. I've seen pictures of Stewart's drums in the 80s and sure enough, you can see a circle of beater dents that go around the black dot of his bass drum head. I guess that old head finally said enough's enough at MSG. Dang, I bet that Imperialstar bass drum had T-rods all the way around making it even more of a pain. Jeff, you earned your money that night: pull snare drum and throne out of the way; disconnect bass drum pedal; loosen and remove 10 T-rods and claws; remove bass drum hoop; remove old head and put new head on; put hoop back on and screw t-rods back into the lugs, etc., etc.