The screw housing is spinning both ways on my Motobatt battery terminal! £50 for a new one, so I'm hoping for a solution - drill and tap the 10mm philips head screw which is in there, or solder on the ground wire is all I could think of. I'd like to remove the screw, but the housing it's screwed into is just spinning with it and inaccessible, so I can't get a grip on it. Any ideas gratefully received. Might be junk?