I was unable to get the drums off my truck. There are 2 flat head screw I am sure that need to come out, however they will not move. I figure I can drill, tap, and heli-coil them. But these are rather large flush mounted screws. Any one know where I can get them? I would also imagine the rim SHOULD be able to hold the drums in place. Are these screws actually needed? The book I have gives no special instructions for brake drum removal.