Window Channel Balance

Question

The metal portion is 28-7/8" long.  It is 1/2" wide.  The only markings are "28 2 GK Caldwell" and the windows are single pane, aluminum frame and about 30 years old.

Casey · Accepted Answer

Hello,

It looks like you have either our S351-29, with a 15-002 bottom attachment, or S390-29, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need a 2820 spring strength option for your replacement balances. Thank you!

Comparison of the S351 and S390 balance shoes.