Need new channel balance

Quick Learner from Carlsbad
For bay window. The only identifier on the window balance says
17 3 BO Caldwell.

It is 18 in long. 5/8" deep. What is the replacement series number?
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2 Replies
Bob
Bob from SWISCO
SWISCO
Expert

Thanks for writing in. See our S380-18 or S385-18. The only difference between these two balances is the 'depth' of the bottom nylon shoe, so compare both with your old balance to see what matches best. You will need a stamp option of 1730. 

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