Wonderment and Amazement. Necromancy is alive and well in CAS City. So it seams. Or seems. I and want to express apology for my failure to provide one and all with my progress in this endeavor.
I FOUND A SPRING!!! A Main Spring was found, cleverly concealed inside another Husqvarna Shotgun!! Really!! An acquaintance, it seems, or seams, had a 16Ga of similar vintage/design that he was really really unhappy with, and let me "look" at his Main Spring. It fit. I kept it. He now has a 16Ga, Double Barrel, Exposed Hammer, Single Shot (How'd that happen I wonder).
I, on the other hand, am a very happy camper.