Green Frog
Member
Even if I was upgrading the action today to get the gun back in action and shootable condition, I'd leave the leaf mainspring since I consider it superior to the coil spring, not to mention the trouble to convert to coil spring. And not even necessary to get the gun working again.
Hondo knows I agree with him about leaf vs coil springs, in fact, I would be more likely to do a retrofit rather than bring one up to "modern."

I would love to know who did the action work and when, though, because it was definitely a bit of gunsmithing art. Most folks wouldn't have gone to that effort and expense just to get some random old gun operational.
Froggie