Thanks to the tip from serger, I received my steel mainspring swivels today from Numrich Arms. I had ordered four of them, and am going to change them out in all of my J frame Magnums....the "new" 640-1, and also my 340 PD, M&P 340, and 640-1 Pro Series. Like serger, I would rather not have any plastic parts in my revolvers if I can help it. The price is very reasonable, and it only took about a minute to swap out the little cup, the only tool you need is a paper clip and a screwdriver to remove the stocks. Don't even need to remove the sideplate.
Here is the original plastic mainspring swivel ready to be replaced by a steel part. This is pretty easy to do, just push the swivel down the shaft, remove the paper clip, and slide the new swivel into place, replace the paper clip, and replace the unit into the gun. Pull the trigger back to take up the slack while removing the paper clip. Make sure that everything works, and replace the stocks. Takes longer to type this than to do the replacement.
Here is the new part installed, and being held in place by the paper clip:
And here is the mainspring unit back in the gun, ready to replace the stocks:
Now, as I said, I have three more of these little guns to go!!
Edit: just changed out the swivel in my 340 PD... Reminder, if you gun has the butt lanyard cut, watch out that the little lanyard pin doesn't fall out when you remove the stocks. No, mine didn't, but it was starting to slide out when I remembered to catch it!! Otherwise, just as easy as replacing the one on the 640-1, but need an Allen key for the issue factory stocks. Two more to go!
Best Regards, Les
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