Re: Cutting a hole in the bass drum...How big, methods etc...
If I were you I would simply get a can or something 4"-6" in diameter and trace it on the back side of the head. Then cut it out, ideally with a razor tool or something similar. Even it its a bit jagged, purchasing a reso ring fixture like "holz" will cover it up. Just make sure that its a specific inch diameter because that's how those are measured. Remember that if your port hole is over 8 inches (i cannot remember but its either 8" or 10") then its the exact same as having no head at all. This is important to remember! I see guys with a 12" or more hole and I always wonder what it is they are attempting to accomplish. Might as well have nothing on in that case.