I can't get the stupid stripped phillips head, rear brake drum, retaining screws out of this *$%! thing. Any easy ideas how to remove the screws? I've used PB Blaster and hammer with punch after the head stripped out from my screw driver. I guess I can drill them out since I have new replacement drums. I can't find any replacement screws anywhere either. Are they really necessary? Can I run safely without them? Thanks to anyone who wants to share info.