Hiya, some local T**T has decided it would be good fun to rip a wiper off my
90 (1999). Found it in gutter about 100 feet away all bent up. Problem is this: When it was ripped off, it has damaged little splined drum that fits between linkage and wiper arm and held on with an allen head screw (part Number: STC987). I have bought a new arm and drum, but CANNOT undo the old one as the head of allen bolt is chewed up and none of it is visible to be able to grip it with anything to remove. Any suggestions on how to remove it and the splined drum. Please?Dave