I believe only a few know the right way to use a hammer driver . One should hold it in neutral position and first drive bit in to seat them turn and hit it again to loosen . I have found in the absents of hammer driver even driving straight in with punch or 3/8 extension will jar the rust bond and make it easier also this will also rearrange the mushed slots . driving hex nut on the flats all the way around can help in the same way . this comes from living in the rust belt .
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