I've got a Table Saw that need some maintenance, problem is I can't get the screws out. There are four steel phillips screws holding the aluminum arbor guide. I managed to get two of the four screws out by doing some serious pushing while turning. The two screws that came out made a popping sound when they broke free. The other two heads started to strip, so I left them until I could find a better solution. I managed to get one more screw out with an impact screwdriver. The fourth screw is pretty much a round hole now and will not budge. I can't get vice grips on this screw, as the head is recessed.
Should I try heat next, a left hand taper or carefully expoxy something to the screw head? I understand the screw outs are pretty much useless on a tight screw. Suggestions appreciated.