I'm upgrading to a E3Dv6 hot end on my son's R1+. Printed a new quick release plate off Thingiverse, but I can't get the old plastic quick release plate off. The screw that allows the plate to pivot won't budge and I'm afraid I'll strip out the phillips head. Is it held on with Loctite? I'm thinking of touching my solder iron tip to the threaded end of the screw to get it to turn. Any ideas before I try that?