I have old double-glazed windows where the frame doesn't allow easy removal of the window from the outside. I had problems with finding anyone who would do the replacement as it isn't as straight-forward as the newer style of window frame - it is pretty difficult to remove the white plastic pieces that press up against the inside of the window pane to keep it tight in the frame.
I made the mistake or ordering a replacement double-glazed window pane that was 5mm thinner than the original window. The thickness had been measured by my experienced Plumber as 25mm but when I went to the shop to order window, the shop owner said it would either be 24 or 26mm, so I went home and measured the thickness (whilst the window was still in place, on the first floor of my house) and got it drastically wrong.
Anyway, I am looking for something I can place in the gap, either between the white plastic piece and the window pane or between the plastic piece and the frame, so that the window is securely in place. Currently, I am using the double-sided sticky foam pads that came with the new window but with winter here, I need to sort this out permanently. I've read about wood being an option but would prefer something that is waterproof/plastic or rubber but I am not sure of what to get or from where.
I know I could just get the frame remade but at a cost of £75, I'd rather come up with a cheaper but effective workaround.
Some photos of the setup are here to help with seeing exactly what I'm describing...
Can any one help?