When it's all tight and everything is as you want, barrels level and all, then you start heating. I dunno if there is a proper end to start on, but I tried it from the muzzle and from the breach on the other side. No difference I could tell. Get another clean stainless brush and put some rosin flux on it to brush the fillet between the rib and barrel. I used rosin core solder of .030 dia. to aid in filling the fillet a little. Then brush the excess out of the way. Keep moving, doing a few inches then going over to other side of the rib. Go all the way down the rib that is up this way. Then flipp it over and do the other rib the same way.
Get to the muzzle and fill the gaps there with the barrels slightly tilted muzzle down.
You're done! Let them cool. Clean up with a solvent. Ring check them. Pat yourself on the back.
I may have forgotten something and I'll correct as needed.
For cleaning/polishing up the barrels, follow the methods you would for blueing prep. If you're doing this job, you are undoubtedly familiar with that!
