what Starride said, except that a propane torch prolly won't get the slugs hot enuff to break loose. need to get the broke piece and nut red-hot, than let it cool a bit, then grip well w/ visegrips and ...... it'll prolly rip off! the screwdriver slot can work, but ya still need to WD40 the hell out of'em first. the missing ones can be replaced with a proper sized nut tacked to a washer that'll span the hole - stronger than original.
Bill
