Im not sure where I remember seeing this, but this issue reminds me of the topic that read something like "How to repair a broken locking bolt?" I believe a rather well known and respected double gunsmith made the comment of you have to know what youre dealing with and take that into consideration. Imho you just dont force the burden onto your customer of re-machining an entirely new bolt or hinge pin if the gun in hand simply isnt worth it. But you know what they say about opinions