locktite comes in different strengths for different purposes, the stronger of which says right on the bottle, that heat will be required for disassembly. if you don't want to heat it for some reason, a good punch for the job, and tap the screw on both sides, and work around the head, back and fourth solid, firm, and consistent tapping. that will break the locktite, it works (alot like super glue).
But before you try all that, is it possible that the screw has been peened on the other side after it was installed, just like they do on scisors. if that's the case, it's pretty hard to extract the screw in one peice, and next to impossible to reuse. what you'll have to do, is break the head off, then turn it clockwise and screw it out the other side, usually a drill bit is all you need for that, but since the screw in the main objective anyway, if itt's peened on the back, just forget about that screw, and find or buy a replacement for the sheared off screw in the other gaff.
what sort of "pro" do you take a gaff that you cant get a screw out of to, anyway? so that you can use the screw on another gaff! LMAO I think that giving in to the challenge of removing that screw, and taking it to a "pro" would never have even crossed my mind. I can just imagine some dude wearing some round wire frame glasses, and an apron, standing there telling me that its a good thing I brought it to him, because its dangerous work, and how many joe-treeman guys have lost their lives meddling around with that particular screw.