Series 380 Channel Balance

A handy person from Florida, USA says:
My window weighs 28 lb.
My actual measurement of the balance according to your instructions is 30".
The following is stamped on my old balance 29 5 BX CMC 11.
What balance do you recommend for me to order.
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Tom from SWISCO responded:
Thanks for contacting us. I'm afraid the stamp only tells us how strong the spring is. It is not used in identification. I recommend that you look at our Channel Balance Home Page and follow the steps in order to find the Series that best matches what you have.
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