Window Channel Balance

A handy person from Clovis CA says:
Trying to find the right replacement. The channel is 5/8 but I assume 9/16 is what I need. It is 28" long. You will see stamp on photo is 2790__30 with B.S.I. and OJ on it.
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Paul from SWISCO responded:

Thank you for posting. We have two balances that may work in place of your current one. Please take a look at our S351-28 and S390-28. These look identical, however, there is difference in depth measurement of the bottom balance shoes. The depth measurement of the bottom shoe for the Series 351 is 1" and for the Series 390 is 1-3/32". Measure the depth of your bottom shoe, like in the diagram below, to determine which of the two balances would make the better match. Since your stamping does not match with any of our stampings, you will need to weigh your sash on a scale and refer to the sash weight chart on the balance store page. 


Measurements of 15-002 bottom shoe.

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