Window balance replacement

A home owner from Lacey, WA says:

Sir/Ma'am:

I'm trying to purchase and replace two window non-tilt balances and I just needed a bit of help ID'ing some parts and confirming what I need. The balances themselves measure 27" for the metal and are marked 2630, looking at them I am fairly certain that I need either S380 or S385 to replace them. I measured the bottom shoe, as that appears to be the only difference, to confirm its depth and I got 1.075" with calipers, which is more than 1" but less than 1 3/32" which would be 1.09375. I'm assuming that is likely wear and tear as this window is nearly thirty years old and that I should go with the deeper shoe?

The other question I had is that there is a small piece of sheet metal that is held to the bottom of the sash with a screw and seems to play some role in retaining the balance, however I am missing one and I'm having difficulty ID'ing the part and procuring it. If I can't find it, I'll see if I can fabricate a suitable alternative, but I'd rather have the right part. Unfortunately, I'm having issues with uploading photos so I've hosted them on another website instead, the links are below.

https://imgur.com/VkJtyJF

https://imgur.com/wkjSVNi

Regards,

Shay

Profile picture of Michael
Michael from SWISCO responded:

Thank you for submitting your inquiry to our discussion board.

If the shoe measures more than 1" but less than 1-3/32" then it was probably 1-3/32" and has worn down over time so it is a safe bet for you to go with the Series 385-27 balance with the 2630 stamp option.

We also have a nylon bottom sash block, item number 17-016, that might fit your sash. Take a look at this part, compare it to what you have, and see if this part will work for you.

A home owner from Lacey, WA says:
Thanks!
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