SWISCO - The Replacement Hardware Authority

Window channel Balance identification

A home owner from Dallas, Tx says:
Please help me identify this balance, I'm unsure of the shoes. I believe it is either a 351 or 390. The channel length is 29'.

Thanks.
M.R.
User submitted photos of a window balance.
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Paul from SWISCO responded:
Hello! The difference between the Series 390 and Series 351 is the size of the shoes. I recommend that you compare the dimensions of those two SWISCO balances to your own to determine which is a closer match.
A home owner from Dallas, Tx says:
Hi,
with a digital caliper I'm getting a reading of 1.066, putting me in between the two. What is the tolerance? should I go over or under?
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Paul from SWISCO responded:
Ah, I see. In that case, I think you'd be okay with the S351-29, which has the smaller shoe.
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