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S351-22 22" Series 351 Channel Balance

Hello, I am trying to figure out which part I need to order to replace my channel balances. I've provided some photos for your review. It looks like it can be either the Series 351 or 390. Thank you!

I have 4 identical windows that all slowly slide down when opened. They have been installed for about 15 years. Would applying oil to the pulley bearings help or make matters worse? I have what appear to be 22 in long S351 style channel balances, but with no 4 digit number on them. One of ba ... (cont.)

Hello. I'm needing to replace 8 pairs of channel balancers. They seem to be series 351 type, with a 22 in. long channel. The number stamped on them is 21 S (with "B.S.I." stamped vertically. ) I'm wondering what strength or weight range I should use. The sliding window pane measures 44 in. x ... (cont.)

Hi- I have 10 windows which need balances replaced. I can't see the difference between the 15-001 shoes & the 15-002 shoes. Our balances are either # 351 or 390? 22 inches from end of metal to end of metal. I also want to replace the clips on the metal sash, some are broken, buy?? How the he ... (cont.)

I have two lengths of completely broken balances from Gapco: 22 inch metal portion stamped 2140D and 3.S.I 34 inch " 3330 and 3.S.I Pictures are included. Need to know your right numers to order. Thank you for your help. Peter

I want to replace a channel balance with S351-22. It is marked 22d.When I try to place an order it requires me to choose option 2110,2120,2130, or 2140 before I can add to my shopping basket. I dont know what the options mean. Thanks. I just need 1.