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Not too hard to do. They would have held it in a jig then silver brazed it and then pinned it, possibly followed by more silver braze flowed in around the pin. Thats how I would do it anyway. The main thing is to control the considerable amount of heat required so as to not soften / anneal the rear of the bolt, but considering it is a cock on closing action then it’s no so critical. Although rehardening is easily done, there are ways to avoid the need to do it. |