In modern sash windows, you happen to be more prone to locate a spring harmony (or sash stability) procedure. This can be a spring-loaded unit which counters the force of gravity, in effect Keeping your sash window open up without the need for cords, pulleys and people steel counterweights.  These https://framed-prints49123.blogdon.net/a-secret-weapon-for-sash-windows-51553565