Tom from SWISCO responded:
June 7, 2022
Thanks for your photos. Based on what I see here, you have either our S351-22 or S390-22, depending on the depth of the bottom shoe. That's the only difference between them. I recommend measuring your shoe and referring to our dimensions to confirm the best match. We also sell the 18-008 top sash guide, which appears to match your original. Comparison of the S351 and S390 balance shoes.
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Thank you for your reply.
I received four of the S-390 units and they fit perfectly.
Further investigation revealed that I have 7 additional windows that need S-390 units.
These windows are smaller and six of the windows have the 2140J code instead of 2150J.
One window has a 2140 W code.
Do I need a different unit for this window?
Thanks,
Don
Tom from SWISCO responded:
June 20, 2022
Hello, Don! I'm glad to hear that they worked. As for these other windows, it sounds like they're the same length balances (S390-22) but with a different weight calibration. Since you said that these windows are smaller, it would make sense that they're lighter, too. Two balances with a 2140 stamp, which is what you have here, can carry a sash weight of 15 through 23 pounds. Don't worry about the "W" and "J" after each stamp, those don't really matter in your case. I think those are just manufacturer brandings and have no influence on the calibration of the spring. The only thing you need to worry about are the numbers. |