The sash in the bedroom is really old and needs replacing. Unfortunately I don't have a spare =A3800 on me, so it's going to get refurbished instead. I've done this before so I know how to remove the beading and get the windows out to works on. The problem is, the frame has changed shape as a result of a century of settlement and is now a bit wider at the top than the bottom. This makes the upper pane a poor fit.
Can anyone think of a way I could build up the frame so it fits a bit better? I thought about trying to create a very thin wedge and glueing it in place, but it can't work out how to make one. Or maybe there's some kind of springy steel product I could get?
Cheers,
John