I have three single-hung windows that are very old, (they don't tilt, just go up and down) one of which won't stay open any more, so I need to replace the parts. I think that what I have is the coil balance variant. Some windows have one coil, some have two...
I'm sorry to say that I know next to nothing about this types of windows because they aren't at all common where I live.
Also, I have looked for markings and numbers, but couldn't find any.
Here are some measurments that I took trying to guess what could be useful. Could you please tell me what to measure exactly if these are not enough?
69 cm (27 inches)
