Window channel balance spring

A handy person from Florida says:
January 16, 2017
The numbers on the spring is 29 s lv cmc 7
I don't see any other numbers
I need a set of two. One for each side of window
I have other windows that have issues, but have not taken them apart.
When I figure out the part number thing, I'll work on those.
Thanks for your help
Chuck
User submitted photos of a window balance.
A handy person from Florida says:
January 16, 2017
Upon further reading I need a S351-29?
The weight of the window, how close do you need to be?
Can you tell anything about the weight from the stamped numbers?
Which are; 29 S LV CMC 7

Thanks
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Paul from SWISCO responded:
January 19, 2017
Thanks for po sting, Chuck. Check out our Series 395 channel balance, I think this may be what you want. I recommend weighing your sash on a scale to determine the best spring strength option.
A quick learner from Florida says:
January 21, 2017
What length do I need? 29 or 30
The metal portion measures 30", but the stamped number is 29 S LV CMC 7
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Tom from SWISCO responded:
January 24, 2017
If your stamp starts with 29, then the length should be 30". That is normal. The stamp is not a direct representation of any physical dimension, it just indicates what the strength rating of the spring is. In regards to your stamp, it looks like it reads "29 6," not "29 S." We have a chart on the S395-30 store page that shows you how much weight each stamp option of ours can support. You may want to weigh your sash on a scale to confirm the best match.
30" Series 395 Channel Balance
30" Series 395 Channel Balance
S395-30
$11.30
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