trigger pull adjustment
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  1. #1
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    trigger pull adjustment

    I have a New Service Target model revolver from 1920 in .45 long colt cal.
    The trigger pull must be around 10 pounds!
    Is there a way to adjust this, or do I need to put in a different hammer spring?

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    Are you talking double-action pull or single-action? That's pretty light for a DA pull and most New Service revolvers I've tried tend to have pretty heavy DA pulls even if they are smooth.
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  3. #3
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    Yes, it's the double action pull. I don't have a device to check what the actual pull is, but it's really strong. Is there any way to adjust this?

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    I'm no gunsmith but there's no real way to "adjust" it. You can lighten the pull some with a small rod placed between the lever of the mainspring but if you do it wrong you can break the spring. Many confuse "lightening" the trigger pull with smoothing it. That's done by hand honing the sear and contact surfaces for a better, smoother release which can feel like a lighter pull. Actually lightening the pull takes some experience and you run the risk of reducing reliability with too light a strike on the primer.

    Normally I'd say try a different mainspring but about all you can find are repops that probably are no better. You can try that so if you break the mainspring you have a replacement handy.
    Socialism is like a Jedi Mind Trick...it only works on the weak minded. SnidelyWhiplash
    I'm an American. Your approval is not required. SnidelyWhiplash
    Good people do not need laws to act responsibly, while bad people will find a way around the laws. Plato



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    Often just a complete disassembly and cleaning old dried oil and grease, and re-lubing can make a huge difference. This gun is nearly 100 years old, and if it hasn't been deep cleaned in the last many decades that could be a major cause of a overly heavy DA trigger pull.

    Best regards,
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  7. #6
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    A 10 pound DA trigger pull on a Colt is not out of line.
    The Colt specs for double action pull for almost all models was to be less then 14 pounds, and I'd think the larger New Service would be even higher.

    The DA trigger pull can be made lighter by a good pistolsmith, NOT a local general gunsmith.

    The technique of sticking a small rod between the legs of the Vee mainspring and cocking the hammer is a valid pistolsmith technique BUT.... first there is a risk an old spring could snap, and there's a lot more to this then it sounds.
    Many Colt's are found that miss-fire in DA, but fire in single action.
    This is because an amateur does it without using a trigger spring gauge to measure the progress and over-bends the spring.

    First you have to know what the Colt factory specs are for the DA and SA trigger pull on a New Service and you have to stay within those limits.
    As far as I know those specs have not been published.

    Often a deep cleaning and application of a good grease on the trigger and hammer contacts can help.
    However, if you want a lighter DA pull with full reliability of ignition the smart move would be to send it to a Colt qualified Master pistolsmith and have him adjust it for you.

    The forum has used and highly recommends two Colt masters.

    Frank Glenn is well known to the forum and has an excellent reputation for quality of work, prices, and fast turnaround.

    Frank Glenn-Glenn Custom Complete Gunsmithing Service Glendale AZ

    Spartan's gunsmith was trained at the Colt factory under a legendary Colt gunsmith.

    https://www.facebook.com/spartanfirearmcompany/

    Either can lighten the trigger pull as light as possible but still have reliable ignition.

    Of course, there is the advice that instead of lightening the spring and getting miss-fires, the smarter move is to practice more and strengthen your trigger finger.
    Last edited by dfariswheel; 04-12-2019 at 12:59 PM.

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    Thanks to all for the advice. I think I will disassemble and clean first and then go from there.
    Monsai52 likes this.

  9. #8
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    I'd suggest NOT disassembling the cylinder unit.
    There's a risk of damage during re-assembly and it requires two special tools to disassemble and reassemble.

    You can do maintenance on the assembled cylinder and crane without disassembly by puling the crane forward and wiping the shaft with a evaporating solvent, push the ejector back and wipe the ejector rod shaft, and wipe the front of the ejector rod.
    Then apply a lube to the crane shaft and the front and rear of the ejector rod.

    After cleaning and applying your favorite lubricant, I recommend putting a dab of a good synthetic grease on......
    The single action cocking notch of the hammer.
    The front and rear of the double action strut on the hammer.
    The top, bottom, and sear face of the trigger.
    The top of the rebound where the Vee spring rides. While it's apart LIGHTLY stone the bottom edge of the spring to round it slightly.
    The inside notch of the hand where the point of the rebound slides.
    The "tail" of the cylinder locking bolt where it contacts the rebound lever on the right side.

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    Thanks, will do.

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    Be thankful if you have a Colt NS with a 10# double action pull. Being a New Service Target I just wouldn't monkey with the trigger expecting a much lighter pull.


 
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