Here are some measurements that I took. Hopefully these make some sense as I have not worked with windows before. I wish I had the old balances so that I could measure them but the previous owner apparently threw them out :-(
Length of channel in the moving part of the window: 16 3/4"
Depth of channel in the moving part of the window: 5/8"
Bottom of plastic piece in channel (from top): 1.5"
I have Milgard H-C40-56x91 (series 5229/5231/5270) which is missing both channel balances. Any hints how to identify exactly what kind of balance is needed? And if you happen to have those? Static window frame length: 34.5"
Static window frame depth: 1.5"
Position of 1st clip (from top of window to top of clip): 6.5"
Lower clip hole (from top of window): 17.5"
I am also attaching photos of the window.
Thanks,
Jussi