SWISCO - The Replacement Hardware Authority

Need some help.

A quick learner from Columbia Maryland says:
2 sizes. 1) 18 7/8 with stamp 1840Z. 2) 28 1/2 stamped 1830Z
User submitted photos of a window balance.
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Paul from SWISCO responded:
Thanks for posting. Can you confirm the metal channel length for both balances? These usually end on the inch. In both cases I believe you have the Series 371 channel balance. If your balance lengths are accurate, they will need to be custom made. Let me know!
A quick learner from Columbia MD says:
Thanks for getting back to me. The smaller one is 19 with a stamp 1840 Z. I remeasured the larger one. It is closer to 28 5/8 with stamp 2830 Z. I found a sticker in one of the windows that are over 30 years old. I couldn't read all of it but it looked AA-- Sponsored series2500 . mst a676? I was guessing it would be 29 inch because of the 2830 stamp. Would 3/8 of an inch cause a problem? Thanks
A quick learner from Columbia Maryland says:
Thanks for getting back to me. I agree the smaller one is 18 7/8 with a stamp 1840 Z. The larger one is 28 5/8 inches long with a 2'830 Z stamp. So Should l order the 371-19 , 1840. And the 371-29, 2830? Would 3/8 of an inch make a big difference?
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Paul from SWISCO responded:
I believe you have a Rollyson window. Why some of their balance are cut down, I don't know. You would think they would make them standard like other window companies. That said, you can try a full inch for the S371-29 (2830 option). I also think the S371-19 (1840) should be fine.
A quick learner from Columbia MD says:
Sounds like a plan,thank you. Should I try just one or order all 16. Can I return if they don't work?
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Tom from SWISCO responded:
It's up to you! You can return the hardware if it doesn't work. See our return policy for more information.
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