If you have a screw that just won't budge here is a trick to try. [I]f you have a small chapman wrench (Lyman Lube sizer style) put a removable Bit in a driver and then slip the chapman wrech on the bit under the screwdriver shank. Ptu the item in a vise and now you can push down on the driver and turn with the wrench handle. Works almost as well as a bit in a drill press and will usually get the job done.