Caldwell 17 4 KP Window Balance

Question

The metal channel part is 18 inches long. The marking reads, 17 4 KP Caldwell. This is for a Milguard window.

Bob · Accepted Answer

Thanks for posting. This looks like either an S380-18 or S385-18. The only difference between these two channel balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the diagram below for reference. Compare to your old balance to determine which matches best. In either case, for a new stamp option choose 1740.

Comparison of the S378, S380 and S385 balance shoes.