Spiral balance

A quick learner from Virginia Beach, VA says:
January 29, 2021
Spiral series: S900
Spiral length: 42
Quantity: 8
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Tom from SWISCO responded:
January 29, 2021

I don't believe they ever made a Series 900 in this length. 42" is huge for such a skinny balance. My worry is that it wouldn't be able to carry the weight of the sash. These are very skinny balances. Can you confirm the diameter of that tube? 
A quick learner from Virginia Beach, VA says:
February 4, 2021
I looked again and you are correct. The window stop is 14" long! So the balance nor window goes all the way to the top.In the picture you can see the screw 13" down. The spiral balancers are 29". Thank you!
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Casey from SWISCO responded:
February 4, 2021

Great, if your balance tube measures 29" long and has a diameter of 3/8", the S900-29 should work for you. You'll just need to locate the colored tip at the base of the tube or weigh the window sash and follow the chart under the balance product description. Thank you!
29" Series 900 Spiral Balance
29" Series 900 Spiral Balance
S900-29
$9.15
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