That’s how they all do it. See Jack Rowe’s video on YouTube, ‘Tightening Forends’. Larry Potterfield likely learned this from Jack who was an outstanding English gunsmith.
It’s the way They do it at the the factory. Lots guns already have a dimple on the forend iron. It’s also the way I was taught . I made a punch year’s ago and have used it successfully many times
Stretch the forearm,,it's the way it's often done. I've seen it on hundreds of guns as have others. From utility to top tier.
Some are haphazardly criss-cross peened . Others neatly staked with one or two lines as in the vid. Often a narrow drift is set in the underside of the cut-out on the iron itself where the forend lug touches it. A couple of wacks and the metal pushes forward to close the gap. Forend tightens up and no messy marks on the bottom or sides of the iron.
I prefer to solder in a shim on the surface of the iron at that point. Sometimes a shim onto the forend lug itself if the amt of play is excessive or easier to fit. A small seat on the FE lug face can be filed out for better contact. Soft soldered into place it won't come free and is easy to do w/o disturbing the lug itself or the ribs. Final fitting takes the longest to do.
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