Channel Balance Replacement or Repair

Question

Hello,

I need four spring powered channel balances for my two front windows. Their design seems problematic using pulleys and an extension spring. The spring is quite powerful and wore, then pulled through the double pulley block anchor hole. They are all 1/2"wide x 24" long. All four failed the same way.
Possibly the double pulley block is available, hopefully improved.

The number 2320 with a small letter v is stamped on the back of the channel.

User submitted photos of a window balance.

Tom · Accepted Answer

I'm afraid the pulley system cannot be repaired or replaced. You will need a new channel balance. We can help, but I'm having a hard time making out what you have from these photos. Can you show me a clear picture of the top nylon attachment? Can you also tell me the depth of the bottom nylon attachment, shown in your second photo? The depth would be the "heel to toe" measurement.