Now I really did it.. I went the route of drill off the heads, removing the grate and drilling a 7/64th hole and using a screw extractor to get out the old screws.. ti worked for the 1st on, BUT on the 2nd one drill bit broke inside the screw and I can not get it out.. it is dead flush with the screw?? Any suggestions? I used a black oxide drill bit, cheapy from a set i already had (bad mistake now).. Can I just get a strong drill bit and drill it out.. there is a touch of a nub sticking out that I may be able to tack weld a bolt on the nub and back it out??