Anybody ever have issues trying to loosen the 5mm Allen head screws from the pulley hub? Mine don't seem to want to budge. Maybe Harrop used some LocTite on the threads? I'm afraid I might break an Allen key or worse, strip the hex head out on the screw. I'm thinking I might have to upgrade from an Allen key to a hex socket to get more torque on it, but I wanted to get some advice here first from someone that has changed one out already.
