Paul from SWISCO responded:
November 22, 2016
Hey, Derek. Yes, sash stops are meant to prevent the window from going up too far. In your situation the 16-028 would disengage the balance because the stop must be missing. I'm afraid we only sell a couple sash stops, but there are many, many different kinds all over the country. I can't be sure of what you have. You may want to check with the original window manufacturer. Alternatively, if you have windows with two sash stops, you could distribute them around the windows that don't have any. You really only need one sash stop per sash.
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Dave Sr. from SWISCO responded:
November 30, 2016
If you have some windows with two stops, then you can take one out and install it in a window with no stops. You really only need one stop per window. As for bending the Yale stop, you could remove it and just install it when you need to remove the sash. Finally, concerning the stuck window, you might just have to force it open, though that might damage the balances in the process. There's no real science to this, you just have to be careful not to damage the window frame or glass. If you want, you can send us a photo showing the problem you're having.
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