Here's the video of Jack Rowe peening a British double that doesn't quite need a "rejoining" but barrels rattle when the gun is shaken with forend off. There is no qualifying by him or Porterfield that the method of hammering the rear hook is for inferior guns only. He further states that the method is the standard in the British Gun trade. No reason to believe otherwise. Gil

https://vimeo.com/352928443