Mon Jan 21, 2013 8:05 am
Clamp a vice-grip down on them and slowly, SLOWLY turn them. If you don't go slowly enough, you're going to end up drilling out half the screw, and that isn't any fun. Replace the screws when you're done.
Sterling M-5, Sterling Mechanical Siren Timer, Federal Electric Co. Type B, Federal C3 1/2, Secomak VS1, Federal Type A (Coded & Standard), AF Timer, various other sirens \ controls