A picture of a the tried and true impact driver is attached. It's got nothing to do with an air compressor and a lot to do with swinging a hammer with care. It redirects downward force into rotation through banging on that massive handle. It works better on screws of substantial size. Small ones tend to get buried deeper in aluminum as I can attest from experience. I just drill those out and upsize the fastener.
Make sure the bit fits firmly in the slot of the screw. If its loose it just bungs up the metal or slips out causing foul language and excessive drinking. I got mine from J.C. Whitney.
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