Yes. I'm interested in a pic too, if you can do it.

The normal way to regulate shotguns or paradox guns is to 'pack' the barrels around their mid-point, or slightly forward of the mid-point. This causes the barrels to bow outwards slightly, to cause convergence at the muzzles, which are invariably left touching.

On those I have re-regulated, the packing has been made from a thin strip of soft metal folded multiple times. I presume it was made too large, and then individual folds snipped off until the gun regulated. The whole lot is then sweated in place with solder or tin, and the ribs relaid.

I'll try to find a photo, think I took one on the last job.