I'm attempting to update the jetting in my carb similar to Taffy/LarryCo. I'm having a hell of a time getting one screw out of the ACV cover. I've completely twisted the Craftsman allen wrench and it still won't budge. Any suggestions? I also had trouble with the one holding the slide inside the carb. Why are these small diameter screws so tight? Is there Loctite on the threads? Any help would be appreciated.