You can make rosin flux with the rosin Brownell's carries mixed into solution with acetone till it won't take anymore rosin. If you can get a machinist clamp. or make one with 3/8" round stock to go in the muzzles to help line things up. However you clamp the barrels together you need to be able to take up the slack as the tinned parts melt together. MAP gas can be useful. The more extra solder you feed in the more you may have to scrape off to clean the joints for blacking. As you are practicing, take your time and realize you can do it again. Double check that the bottom rib is straight. If you use wedges have the top opposite of the bottom. I have better luck having the top rib and barrels wired up then flip it over to put the bottom rib last. That's all the things I can think of right now I have learned the hard way. Later, MKII
