I thunk I posted an answer to this brass frame peened problem here. Maybe it was elsewhere.
It was to find a narrow rimmed bushing size 7/8ths by 1 3/8ths in 14 gauge.
Hardware stores carry them usually.
File a little to get the bushing layed on the frame and surrounding the ring that gets peened from the cylinder. Cut it away where the hammer recess and the loading port are.
Solder the modified bushing to the brass frame.
Sink the nipples in a little deeper by the amount of the bushings thickness so caps won't chainfire on the new little steel backplate you just made to endure the force from the cylinder recoil and spread the force so nothing gets peened in anymore.
The bushing in place things are fixed up relatively easy and the gun will last a good long time shooting normal loads for the caliber.
If this is done to a new brass framer it'll last bout as long as a steel frame with normal loads.
People say the arbor can pull out and loosen. They are right but.....if a person knows when to drive the wedge a little deeper or not shoot the gun with any "loose" to it it'll last.
Banging a wedge in too tight can pull the arbor threads and loosen the gun.
Wedge gets bad replace it before shooting anymore. Cylinder gap widdens fix it before it gets worse.
Shooting any Colt type cap&baller when there's "loose" to it accelerates the wear and tear on ertain parts.
When the cylinder gap widdens with a brass framer stop shooting it and fix it and then go back to shooting.
Anyway....it doesn't cost anything really or it isn't really difficult to solder on a little backplate of steel and shorten the nipples or sink them in a little more.
Couple hours of easy fiddling around with a bushing,solder,and file and stone.
Now if the gun gets so bad it needs a new wide wedge made from tool steel or the arbor gets loose in the threads there's fixes for that too.
I've fixed the brass framers for guys with out a big income at the time. Come around depressed cause their old cap&baller was out of commision thinking it was ruined for sure. Thinking it would take a miracle by the tooth fairy to make it good again. I'd get out a bushing....cut it,file on it,solder it on the gun,shorten the nipples with a stone, and load er up and show the Hombre......all better and you can be happy again. ha ha ha
Some people get down right attached to their good ole brass framers. Like an old pet or something.
I have one like that. Fired thousands of normal(not reduced) loads thru er. Got it around 25 or more years ago. Still tight and as viable as my steel framers.
It's like a good ole Buddy like a pet or something. Of course I learned to put the steel backplate on the gun before ever shooting it. That's because my first cap&baller was a brass framer and....it fell apart because I didn't know to keep it maintained tight and shoot squib loads from it to get it to last longer.
The cylinder gap got large. The arbor got loose. the wedge got horse shoe shaped. It spit stuff all over the place when I shot it. I got mad and threw it away as far as I could throw it into the woods.
My brother retrieved it and cleaned it and used it as a wall hanger till tradin it off on another hunk of junk at a gun show.
That was one accurate cap&baller when it was new. I tested it shooting at sticks my brother threw in the river down the hill from his house. I cut every stick in half and then cut those in half as they floated down stream. Floated way down there. Must have been beginners luck because after that I couldn't hit the broad side of a barn with it for a long time. When I finally got good with it it fell apart.
It had me hooked though. Had to have another. Got a steel framer and never looked back. Of course I got another brass framer and still have it and ,like I said earlier, it is still firing and is tight and viable. I kinda got attched to that brass framer. Especially once I found out the little steel backplate made from a narrow rimmed bushing saved it's life and longevity.
I got rabbits and squirrels for supper with it. Dispatched wild wood chucks with it. Put down an old sick hound with it. Even carried it in my coat pocket for defense when living in a bad city. I pulled it once when a gent got his lil 25 auto out. He saw the long barrel and all,I'd guess, and muttered something bout a mother or something and turned and backed off. ha ha ha ha ha
A shiny brass framer with a long barrel would look kinda mean out on a dark street some dreary night. ha ha ha ha