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a good point groundcontrol,a bolt through the stock will complicate things.the italalians were the first to make this practice widespread,although it is fairly universal now,especially with u/o,but english s/s are still made the traditional way.before attempting any bending you need to establish if the butt stock is held by a bolting system.ie remove the butt plate/pad and have a look. the guy in the video ,jack rowe, i think he is in his late eighties in this clip, is/was regarded as one of the great experts in all facets of english gunmaking.what he appears to be doing so casually has a tremendous depth of experience behind it.
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A lot of the English guns dont have a butt bolt. I can recall my father bending shotgun butts, an interesting process