Searching for 28i jk5 cmc 5

A quick learner says:
December 17, 2019

Looking for two of these. Window is just over 38 lbs.

the number on the side are 28I JK5 CMC 5

Windows are only three years old but a window company came and took both channel balances from the pair and now are unresponsive. Also wanted over $300 to do the repair.

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Bob from SWISCO responded:
December 20, 2019

Thanks for posting. Take a look at our Series 770 Channel Balances. See if this configuration matches your current hardware. Now, 28I isn't a standard stamp option; but we can custom make the S770-28 with this stamp code, which for a window sash in the weight range of 43 through 45 lbs. Let me know if this indeed what you'll need, and we'll get this started for you. 
28" Series 770 Balance
28" Series 770 Balance
S770-28
$12.70
How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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