With rear upright screws and the door-hinge & door latch screws, I use a mid-'60s hand impact driver meant for use on Japanese motorcycles (with a 1/4" drive phillips bit) and a hammer. The grade-nothing japanese screws would instantly round out the drive crosses with std screwdrivers or air/electric drivers; the only hope of getting them out in useable condition was the hand impact driver. In the case of the mentioned screws in a Pantera, they are the ones you really DON'T want to come loose! Hand-operated all-steel impact drivers identical to my old one are cheaply available.
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