I have purchased 20 of the S765-33 : 33" Series 765 Balance to repair ones that have broken in my windows.
I have found good information on other balance installation but since there's no pop out stop for them since there is the string with it. So let's assume I have gotten my lower window out, I think that I would attach the top part with the string and then pull it down and connect it to the bottom and then slide the window down on it?
I have never worked with windows before and haven't found much about these kind of balances.