1st Gen Colt SAA Broken Mainspring
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    1st Gen Colt SAA Broken Mainspring

    Sent my 1880 Six Shooter to Jim Martin and he suggested I post a photo of my broken mainspring (possibly the original) because it's not properly ground. Any DIY mainspring DIYers out there are urged to fair the sides and surface properly so as to prevent the ridges that create weak points (I hope I'm explaining this correctly, Jim). And Thanks!

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    Last edited by coltnyc; 05-03-2017 at 06:54 AM.
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    I don't see any evidence of that main spring ever being "lightened". Maybe it just broke.
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    Quote Originally Posted by phyllis1 View Post
    I don't see any evidence of that main spring ever being "lightened". Maybe it just broke.
    It was ground on the rear flat & all the grind marks were left on it & it was narrowed unevenly towards the top,take a closer look.
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    Quote Originally Posted by Jim Martin View Post
    It was ground on the rear flat & all the grind marks were left on it & it was narrowed unevenly towards the top,take a closer look.
    I believe you Jim. I just don't see any pics of the back of the spring. Maybe I'm missing it?????
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    Quote Originally Posted by phyllis1 View Post
    I believe you Jim. I just don't see any pics of the back of the spring. Maybe I'm missing it?????

    I shipped his colt this morning & when I called him that it was on the way I mentioned your posting,the broken spring is in the box along w/a note to take pics of how it was done along w/a note I wrote about the crappy work.
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    Quote Originally Posted by Jim Martin View Post
    I shipped his colt this morning & when I called him that it was on the way I mentioned your posting,the broken spring is in the box along w/a note to take pics of how it was done along w/a note I wrote about the crappy work.
    Thanks, Jim.
    If he doesn't, I have one that is really "Bubbafied" that I can shoot and post. It's unbelievable! Looks like someone took an emory wheel to it. Amazingly, the gun still shot. The hammer block is with Jim Cornwall to be re-built and a new cam installed as we speak.
    Darrell

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    Jim,
    I'm posting your message which was "This is why the mainspring should NEVER be ground on the flat side of the spring".
    Thanks again for the excellent work.
    Will


    fullsizeoutput_539.jpeg fullsizeoutput_538.jpeg fullsizeoutput_53c.jpeg
    Last edited by coltnyc; 05-06-2017 at 08:28 AM.

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    Quote Originally Posted by coltnyc View Post
    Jim,
    I'm posting your message which was "This is why the mainspring should NEVER be ground on the flat side of the spring".
    Thanks again for the excellent work.
    Will


    fullsizeoutput_539.jpeg fullsizeoutput_538.jpeg fullsizeoutput_53c.jpeg
    I was hoping that all the scratches from the grinding or filing would show.

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    Jim and I have had several conversations concerning grinding on the Mainspring. I have all 1st Gen Colts and I like the "heavier" Mainsprings put in by Colt. This mainly was due to the "hard" primers of the early days. When you see the Cowboys in the old movies, you will see them bring the revolver up into the air and lower to horizontal to fire. The revolver was easier to cock when lowering to to the horizontal firing position.

    Today, most want a light Hammer pull and Trigger pull. I like the way the Colt designed the 1873 originally. Grinding the Mainspring is almost an "art" to get them correct. ANY grinding marks will leave a spot that can break and the one shown has a lot of them. The Mainsprings today are not near as heavy as original 1st Gen Springs and I love the way they feel......I don't plan on being a "Shootist", so the heavy pull is fine. The best thing is don't grind on a Mainspring; buy a lightweight Spring if you like the feel.

    A BIG thanks to Jim Martin for all his teaching to me on the Colt SAA revolver; I always listen to the "The Master"!!!!!!

    Oh yea, Jim is the one the told me about whey the old movie Cowboys cocked and fired the correct way too!
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    To add my own general spring-ology, in my case mostly from working on sidelock percs & flints; if you must weaken a spring never grind or file across the spring - do it lengthwise. Grinding or filing leaves tool marks, tiny scratches, that when crosswise tend to allow the start of a crack, then break. Reducing the the mass of the spring weakens it & sometimes along the sides was as effective as on its wide surface. Of prime importance is to avoid concentrating the removal of metal; carefully spread the removal along the length ----->
    Last edited by rhmc24; 05-07-2017 at 06:02 AM.
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