Balance measurement

Thanks for writing in. The Series width and depth of the metal channel used in the Series 775 is 9/16" by 9/16". However, I stress that in general we highly advise against trying to use different balances with replacing originals. It's always best to try and use the same type of balance, or as close as possible. If your balances were a jambliner system, I don't think this is going to work; you ultimately may be better off taking your jambliners to a local millwork and having them replace the setup for you. Let me know what you think.

Perhaps I can be of assistance. I am assuming your current spring system uses something like our 15-104 Friction Shoe. You may be able to use a S751-34 Channel Balance instead; this comes with the 15-014 Knife Lock Shoe attached. You'd want to try the stamp option of 34C, for a sash weighing between 22 through 27 lbs. Keep in mind I am very skeptical that this will actually work; I certainly can't guarantee that it will. As Bob said, trying to switch components this drastically often has poor results. Still, if you really want to try this, this is your best option. Otherwise, replacing the jambliners is ultimately the conventional solution.