Great video to show how to do it right. I have checked many of my doubles that "rang" and have found that I could still slip a .001 feeler gage in spots on some. So the bottom ribs and some of the top ribs on a lot are not 100% soldered the whole length. If you do any rust bluing you can see for yourself bubbles coming out from different areas of the rib. If it held up for 80-100 years it will probably hold up for another 80-100 years.

Last edited by David Williamson; 06/02/21 04:59 PM.
David