by chappy » Tue Dec 30, 2014 9:49 pm
Just as a possibility, I have also heard that putting a drop of super glue on the end of the allen wrench
and inserting it into, the allen screw.
Let it dry , and then give it a try, it usually works, and then a bit of acetone dip should disolve the super glue and relase the screw from the wrench with a straight pull down, so as not to brake the tip off the wrench.
Bob