hopkin&allen shotgun help

dj_28 · July 15, 2012, 08:54 PM

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.

Thanks guys,
DJ

PetahW · July 16, 2012, 09:51 AM

FWIW, With the assembled action in hand, why not just make a few measurements from a little beyond the mainspring's rear anchor point, to the hammer attachment point, and go from there to fashion a new mainspring 2/3'd the width of the tang at the rear anchor end, tapering to whatever width was needed to swing with the hammer ?

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dj_28 · July 16, 2012, 10:56 AM

That was my thought also. But the thickness of the spring is what I need to know more so than then the lenth and width.

DJ

PetahW · July 18, 2012, 11:28 AM

I don't think I've ever run across a leaf-type mainspring more than 1/8" thick at it's base, so I'd start at .125", tapering to .10".

If it turns out too strong (hard to cock), it's easily thinned, but if too weak (misfires) it'll have to be either shimmed or replaced with one stronger.

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July 15, 2012, 08:54 PM	#1
dj_28 Member Join Date: May 30, 2012 Posts: 26	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. Thanks guys, DJ

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July 16, 2012, 09:51 AM	#2
PetahW Senior Member Join Date: September 19, 2008 Posts: 4,678	FWIW, With the assembled action in hand, why not just make a few measurements from a little beyond the mainspring's rear anchor point, to the hammer attachment point, and go from there to fashion a new mainspring 2/3'd the width of the tang at the rear anchor end, tapering to whatever width was needed to swing with the hammer ? .

July 16, 2012, 10:56 AM	#3
dj_28 Member Join Date: May 30, 2012 Posts: 26	That was my thought also. But the thickness of the spring is what I need to know more so than then the lenth and width. DJ

July 18, 2012, 11:28 AM	#4
PetahW Senior Member Join Date: September 19, 2008 Posts: 4,678	I don't think I've ever run across a leaf-type mainspring more than 1/8" thick at it's base, so I'd start at .125", tapering to .10". If it turns out too strong (hard to cock), it's easily thinned, but if too weak (misfires) it'll have to be either shimmed or replaced with one stronger. .