I dont work on these things. Cant see well enough and know nothing anyway. I have an old Craftsman mower my friend has been helping me with. One of the screws on the metal plate that controls the rods to the carb is stripped on the engine. My friend told me to put a wee bit of JB weld on the screw. Seems to me it would melt off do to engine heat? Would Lock Tight be a better way to go?