This panel is in a neighbor's house. It is accordion bending maybe an inch along two vertical hinges and the little putty that is left is dropping out freely. The panel is in a room addition that was added in 1905. Pretty good shape I'd think, for that old. I got up and looked close. I don't see any lead breaks or joint failure. The cracked pieces are minimal and still integral. Since the lady of the house knows I'm a stained glass expert I was consulted, and I offered her the extent of my expert opinion: The panel is very pretty. I did offer to post a picture on this board, hoping that someone would volunteer to describe the steps of a maintenance effort for this panel. Do you typically remove a panel like this, with largely intact lead, to flatten it and putty it? (and add a horizontal bar or two). Does anyone ever succeed in helping an old piece like this by working on it in-place? Pushing at it, picking and puttying, cussing, etc? I'm not planning on working on this. I'm an expert at self-preservation too.
Don, a few years ago I was faced with a similar situation, so I puttied some on one side, then on the other side, and then in a few days went back and puttied more....took the better part of a couple of week, to get it cleaned up...but with a careful hand, it turned out pretty good. Barbara in Michigan
Well it looks like it has 2 vertical bars and 1 partial horizontal bar. Flattening a window in situ is a bad idea. When the window flattens it has to move somewhere. In situ it has no place to move to. This window would be best served by removing it to a bench, pick out the loose putty, flatten the window, do lead repairs as needed, Hxtal epoxy the broken glass, reputty and add proper rebar as needed
Personally I would remove the window with its sash, and then remove the actiual leaded glass panel from its sash in the studio. Then, proceed as Vic recommended.
As Vic pointed out, If the panel is deflecting at the vertical leads, I would add one
or more continuous horizontal bars. The "partial" horizontal bar isn't doing much if anything. In order for a support bar to function it must engage the frame/sash.