For myself, I just take the proper screwdriver for the screw, seat it in the screwhead, and give it 1 or 2 sharp raps from a hammer. This works the best for me. The force of the hit breaks the corrosion between the screw and threads. On something like an aluminum rim where the center cap is held on by stripped, rusty Phillips screws, it's great. There's no risk of your punch/air chisel slipping off the screw and gouging your/your customer's rim or center cap. No risk of stripping out screws you might need again. As well, in a lot of those cases, the screw is countersunk so you can't even get at the edge. When I'm cleaning scrap aluminum rims to haul in, if I see rusty screws I'll whack them all once or twice before even trying to turn them. Be sure to use a screwdriver you don't mind marking the handle up on. Westward used to make screwdrivers where a steel shaft run from the blade right through to the end of the handle, specifically for hammering on. I don't know if they still make them, mine are over 20 years old. Those were the only ones I ever saw like that, but you never know.
eta. Hitting 2 hammer heads together like is mentioned in the video... is not smart. Hitting 2 hardened, brittle faces together can cause flying shrapnel
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