Silverline single hung window balances

A contractor from Florida says:
September 30, 2017
Hello. I have 5 windows I am needed to replace the channel balance. model are silverline series 2100
code s-019-2
rating H-R35
mst-3850
single hung
the channel I took out are 27" long.
I am in sure what model to order as I do not know the weight. Any suggestions?

thank you,
sean
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Tom from SWISCO responded:
October 2, 2017
The only surefire way to identify the option you need is to remove the window from the jamb and weigh it, unfortunately.
A bathroom scale will suffice.
27" Series 795 Channel Balance
27" Series 795 Channel Balance
S795-27
$13.61
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