If you determine that the barrels fit perfectly with no wiggle, no binding, no excessive friction anywhere and they don't need to go to an expert gunsmith for fine fitting I guess you reinstall the cocking hook, close your eyes and hold your nose and try the barrels back on the gun. It's 50/50 wether the cocking hook will release when you attempt to remove the barrels. If it will not disengage you should then take it to an expert gunsmith to fit the cocking hook to the cocking crank.
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