Channel window balance

A home owner from Charlottesville, VA says:
April 16, 2017
I am trying to replace some broken channel window balances for my tilt out windows. They are 28 in long and by my measurements the channel balances measure 1/4 x 1/4 in width and depth. There is the number 2800 on the balance and under that is stamped BSI (but backwards) and underneath that LJ.
User submitted photos of a window balance.
A home owner from Charlottesville, VA says:
April 16, 2017
To correct the measurements - they are 9/16, not 1/4 as in the original post.
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Tom from SWISCO responded:
April 19, 2017
Thanks for posting, and for the clarification. That makes a lot more sense. Check out our S770-27 channel balance. I think this looks like a possible match. I think our 28C option should work for you. This carries a sash weight of 18 through 23 pounds. You may want to weigh your own sash to confirm. If you find it's less than 18 pounds, go with the 28B stamp option (12 through 18 pounds)
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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