With the correct sized screwdriver and the gun firmly secured, a rubber mallet can give a little persuasion while applying torque by tapping the end of the screwdriver.
When resecuring the screw, less torque or maybe a few wraps of plumbers tape might help. If it loosens later abandon that idea and get a new screw.
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la plus belle des ruses du diable est de vous persuader qu'il n'existe pas!
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