Can someone tell me if LA main springs are somehow different { ie longer} than SA springs and what might be compatible. I need to reduce the weight on my 2nd model 44 spl and an N frame Wolf power spring does not work. If incompatible with newer springs , how can the original spring be altered to reduce power. Thanks SR

Always have found K/L mainsprings are the same regardless of the age of the revolver. Why are you so obsessed with reducing the mainspring tension? For most the length of pull is more the issue on N Frame guns, not the spring weight!

My issue is with excessive spring weight. This particular revolver has a DA pull greater than my trigger scale will measure. Obsession has nothing to do with it I'm trying to find someone with experience on long action n frame main springs and how to reduce their strength. Thanks for your reply

To my knowledge all K/L/N springs are the same. If you have a post war gun take the springs and set them side by side and check the dimensions. The pre-war ones may seem more rebust, but again, I believe they are the same.

If they are, email me or text me your address and I will send you one to play with. I have taken factory springs and narrowed them where at the point they bow the most under full cock which you can pinpoint with the grips and side plate off.
[email protected] or 417 861-2362

I use a mainspring from a Model 29-2 in my early Triple Lock shooter and it works just fine. I am keeping the original aside because it has some severe rust and I am afraid it will break if used. The two springs appear to be identical and they seem to result in similar DA pull weight.
I wish I had a pull weight gauge that would register the heavier DA pull accurately.
Scott

The easiest way to make a spring have less tension is to put a large radius bend in the middle, adjusting it to where it is how you want. A properly tempered spring will stay where you put it. S&W mainsprings are normally very good in this regard, except for the stainless ones. Those have an S stamped on them. All the mainsprings are the same, K/L/N, except for minor variations due to manufacturing tolerances.

Thank You 29 and ToolGuyand Scott, This particular spring is approx. '31 2nd model. And ROBUST is the correct term here. I have spoken with an older Smith Wesson gentleman and he had mentioned the thinning of springs when he worked with Bob Chow and the King Sight Co. in Cal. Unfortunately because of the passage of time he can no longer work on my gun. I was apprehensive of taking a file to this one as I have no experience and no replacement. Will do some more checking let you know what I find. I do appreciate yor responses. RS

Not a K or N frame, but I once thinned a Colt C&B flat hammer spring by using a polishing wheel in order to lighten the trigger pull - polish and measure, repeat, repeat. It took a lot of polishing. I didn't want to use a grinder for fear of the spring metal losing its temper.

If you do grind on a spring, keep the temperature down. When it starts to heat up stop and let cool off.

__________________
H Richard
SWCA1967 SWHF244

You would need to get a spring above 800f to effect its temper.