Window balance

A quick learner from Culver city says:
I can't seem to find the type of window balance
Thumbnail of the uploaded file named 27R balance stamp BSI
Thumbnail of the uploaded file named 80D534A9-132E-4BB9-BFFB-53EA8682A0D3.jpeg
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Casey from SWISCO responded:

Hello,

Take a look at our S751-28 channel balance with a 27R spring strength option. Don't be deterred by the color of the nylon attachment since they serve the same function. Thank you!

How to install a ribbed tilt channel balance with knife lock shoe
How to install a ribbed tilt channel balance with knife lock shoe
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