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Window channel balances

A handy person from Delaware says:
I need to replace 27" 351 channel balances. The originals are stamped "162" on the sides. What stamp option should I order.

I also need to replace 29" 351 channel balances. They originals are stamped 182 on the side. What stamp option should I order?
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Tom from SWISCO responded:
Can you confirm your stamps and length? A "16 2" stamp should be on a 17" long balance, and an "18 2" stamp should be on a 19" long balance. If your information is accurate, then you have kind of a weird setup. I'm not sure why the manufacturer would do it that way. In that situation, I would weigh each respective sash on a scale to determine the best option for both. That's the best way to be 100% sure.
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