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Thread: Reduce the strength of Pietta Spiller and Burr mainspring?

  1. #1
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    Reduce the strength of Pietta Spiller and Burr mainspring?

    Hi all,

    The hammer pull (and trigger pull) on my Pietta Spiller and Burr is tremendous.

    I am contemplating filing on the mainspring to weaken it. I've never done this before, but I understand that one should "swamp" the sides of the spring, not the main faces. In other words, we make the spring narrower, not thinning the thickness of the material.

    Is this the right way to go about it?



    Steve

  2. #2
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    Steve,

    That was my understanding as well, but I've never done it. Someone sent me these links. Pretty good article. It's about Pietta Colts, but certainly a lot of the info would apply to other Pietta models.

    http://www.theopenrange.net/articles...a_Part_One.pdf
    http://www.theopenrange.net/articles...a_Part_Two.pdf

  3. #3
    Muley Gil is online now
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    Yes, narrow the sides. I have done it to single action revolvers & to S&W revolvers. Make sure you polish the sides to a mirror finish. You do not want to create any stressors.
    Gil Davis Tercenio
    # 3020V
    34th Battalion, Virginia Cavalry
    Great, great grandson of Cpl Elijah S Davis, Co I, 6th Alabama Inf CSA

  4. #4
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    No problem, I have a buffing wheel for polishing medieval armour.

    Steve

  5. #5
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    Any idea how much I should take off each side for starters? 1/16th?

    Steve

  6. #6
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    Being this is a revolver, I would take 1/4" off each side.
    Muley talk about "stressors" please. I took down a jury rigged mainspring in one of my carbines a while back. Ground down the flat part of the flex part with a Dremel. I was careful not to generate any substantial heat, and was careful to keep the thickness even and not to create any noticeable dips in the surface. Took some time but finally arrived at a great trigger pull with a nice fast hammer fall. Been shooting the gun this way I guess five years.

  7. #7
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    By stressors he means stress risers. Any sharp cut or notch will result in stress concentrations at that point and cracks will form and propagate from them. It’s why airplanes have oval windows instead of square.

  8. #8
    Muley Gil is online now
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    What Steve said!
    Gil Davis Tercenio
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    34th Battalion, Virginia Cavalry
    Great, great grandson of Cpl Elijah S Davis, Co I, 6th Alabama Inf CSA

  9. #9
    Chris Sweeney is offline
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    Umm - maybe the Spiller & Burr spring is gi-honkin'-normous compared to other repros, but since the widest of any of the springs in any of my Pietta revolvers is just about 7/16" I'm thinking that 1/4 inch off each side might be a tad aggressive, at least for the first pass. . .
    Chris Sweeney
    Commander, 44th NYVI

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