New 686+ mainspring came loose. Strain screw tight

[Ron3]

Chalk it to “anomaly”. Odd shit happens occasionally.
I do know my way around DA Smith Revolvers; but if nothing is broken, everything tight- that shoulda never happened.
You might check to be certain Strain Screw hasn’t been shortened for a lighter, DA trigger pull.
If it has, there isn’t the tension on Main/Leaf Spring, which conceivably cause Mainspring to pop out.

I bought the gun new.

When I removed the mainspring as part of replacing the safety with the Original Prescision button, I made sure to tighten the strain screw very tight, and with Blue Loc-tite.

I've had no light hits, and the first thing I checked was the strain screw by attempting to tighten it. Didn't budge. Then I loosened it and it took considerable effort to defeat the Loctite. With screw nearly out I was able to put the mainspring back in place without removing the side plate.

I removed the mainspring & sidepate last night to inspect everything.

Probably gonna sell it. I lose faith in a gun easily.

I've been dry firing it a bit. Everything feels fine.

Perhaps something shifted when the cylinder was tight because of the lead & grease debris?

I'd have to remove my optic and mount as well as the safety hole plug and stock grip to put it back to stock if S&W would send me a return label.

They'd probably fire it, do a cursory inspection, and send it right back.

At least if my Colt King Cobra breaks I can send it back as-is because it needed nothing changed. Awesome revolver. Well, except for several reports of broken hammers.

I'd love to see someone make some milled / forged steel hammers to put in new Colts. I'd do it. Not sure if broken hammers are an Anaconda or Python issue. Could just be Cobras / King Cobras.