Sash Balance Stamp 2790

A quick learner from Dixon CA says:
Hello I was looking to purchase 2 sash balances for a project we are working on. The balance I found was the 28" Series 351 channel Balance but the options stop at 2770. Do you have a sash balance identical to the 28" Series 351 but has the strength and stamp of a 2790. The width of the channel is 1/2" the length is 28" metal edge to metal edge.
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Emily from SWISCO responded:

Hi there!

The stamp on your balance might be outdated. You'll need to remove and weigh your sash to choose the appropriate spring strength option. There's a chart on the Series 351's product page that shows you which option you'll need based on the weight of your sash. 

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