The title isn't quite right. It wasn't broken. I just couldn't get it back together. The truth I got it put back together, Finally.
I had to take it apart to remove a wrong caliber cartridge.
Never shove a cartridge into a levergun magazine in the semi-darkness.
Got the rifle apart and the wrong cartridge removed.
But reassembly did not go right. The right sideplate ( loading gate side) would not seat . Just couldn't get it in. Couldn't get the screw through from the other side to pull it down tight. Even filed and stoned the inside of the sideplate inner edge. Just wouldn't seat.
Went to you-tube, watched 5 different video's, no help.
My Cowboy Gunsmith passed on 10yrs ago. About a year before I stopped Cowboy Shooting. He was the last one that had it apart. Haven't put a 100rds through it since. I had apart at least a dozen times in the 20 years before then. Bob replaced the broken right hand lever spring.
My Buddy came by to go to lunch today, we looked over the rifle.
I had tightened the leaf springs all the way down before setting the lever, so the spring stuck out and I didn't see it. He did. So I loosened the spring screws, shifted them BOTH into place, placed the "knuckles" and pins into place and slid and seated the sideplates. It went back together slick as you could want. Tightened the screw springs and I was back in business.
Worked smooth and slick as ever.
Just took another set of eyes to see the problem.