Do you mean like this Parker Reproduction?

[Linked Image from i.ibb.co]

I believe that was a brazed shoe lump that fell off the barrels. I keep the photo around simply to remind me to have nothing to do with sleeved guns. Of course a Parker Reproduction isn’t a sleeved gun, but, to me, the point is the same. I’m not sure that what we are looking at can be economically repaired, and, if I’m being honest, I don’t care.

I don’t own a Parker Reproduction.

Best,
Ted