Join Date: Oct 2008
Location: South Coast Ontario
Thanked 93 Times in 82 Posts
Rep Power: 9
Rule #1 Lefty-loosey, Righty-Tighty.
Rule #2 Remember Rule #1.
is there anything left above the surface, or is the screw snapped off flush? if you have enough left above to grab with a pair of vice grips, carefully file down opposite sides of the screw to give a surface for the vice-grips to grip, heat the aluminum with a torch, and turn the screw.
If it is flush, do you have access to the underside, and is the foot of the screw protruding far enough to get vice-grips on the bottom?
Otherwise, it is cobalt drill bits, tapping fluid and slow speed.
Rule #3 When you put it all back together, coat the screws with anti-seize. You will have to take it apart again. THAT is why it was assembled with screws.