Caldwell window balance lifts replacements

Question

What part#'s are these 2 lengths?:

1. Stamp 17 3 HT CMC 4
Metal shaft: 18" x 1/2"

2. Stamp 28 4 KS CALDWELL
Metal Shaft: 29" x 1/2"

Thank you!
Kalei

Casey · Accepted Answer

Hello,

With this combination of attachments, you could have either the S380 or S380 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment.

You'll need 1730 spring strength options for your 18" replacement balances and 2840 for the 19" long balances. Thank you and let us know if you have any other questions or concerns.

Comparison of the S378, S380 and S385 balance shoes.