Kenny, the issue isn't likely a worn part, but, more likely, old thick grease on the trigger plate. The cocking slide rides back and forth on the trigger plate, and when the grease gets old it isn't acting as a lubricant. The cocking slide isn't going far enough forward for the cocking crank to release the cocking hook. Also probably gummed up is the unhooking slide. As a temporary measure, get a can of brake cleaner (NOT Carb and Choke cleaner), and with the little tube in the spray nozzle, hold the receiver butt end up, and insert the tube into the receiver in front of the bolt and give one short squirt. You shouldn't need more than one or two short squirts. This thins the grease out enough to let the cocking slide travel fully. This is enough to get the barrels off, but now the gun needs a good cleaning and lube.
Going in the side and unscrewing the cocking hook from the barrel very frequently galls the screw and the water table. Some guns can be opened far enough to safely get the screw out, but many do not.
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