Chris,

Bill only works Monday thru Friday. If Bill needs to see the barrels, you could email pictures to his apprentice.

I have reattached a sling mount that had just pulled loose. I fluxed the mount, clamped it to the barrel, and applied heat.

If the joint is slightly dirty or oxidized, I think it needs to be cleaned. It likely can be cleaned in an ultrasonic cleaner, then fluxed, and heated.

Best success.

BTW, How are the bores?