hopkin&allen shotgun help
I have a H&A single shot shotgun that was brought to me for repairs. It has a missing mainspring,stock,and trigger guard. The trigger guard is no big deal Munrich has those. But the stock and mainspring are sold out. Agian not to worried about the stock, I can make that without any trouble. The mainspring is what I'm having trouble with. I can't find any helpful dementions on the spring (thickness, width, lenth, and so on). I would make one if I knew these dementions and would bend to the proper shape and heat treat it apropriatly. Just can't find this info.
Don't get me wrong, I would love to find the replacement part and not have to worry about making it and just have to finish the stock and forearm. So any help would be appreciated.