Coil balance spring replacement

A quick learner from East Hanover, NJ says:
December 4, 2023
Hi. I have several windows in the house that have broken coil springs. The company that installed these windows call windows of the world are no longer in business. Can you help me find the correct replacement ?
Thumbnail of the uploaded file named IMG_0073.jpeg
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Casey from SWISCO responded:
December 5, 2023

Hello,

Your pivot shoe reminds me of the 15-140 shown below, which is used with the S150 coil springs and related items. Take a look and compare the specifications to your assembly. Thanks for posting! 

Alternate image for 15-140
Alternate image for 15-140
A quick learner from East Hanover, NJ says:
December 16, 2023
Hi again! Thank you for your help. So I need both left and right side. The sash is 12.6 lbs. Do I order:
2 x 15-140
2 x 15-150 (6 lbs or 7?)
2 x 15-143
2 x 15-144

If you can confirm or clarify the above, I'll start placing orders. I have up to a dozen windows that need similar repairs.
Please let me know. Thank you very much!!
Bob
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Casey from SWISCO responded:
December 18, 2023

I would recommend using one S150-6 coil spring on each side to support your sash weight. You will also need the 15-145 support barrels to go with the bushing and barrel. 
A quick learner from NJ says:
January 31, 2024
HI, Your team has been great answering my questions and even editting an order for me that had an error. I've placed 2 orders and repaired 8 windows without a problem. Excellent. Your series S150 Coil Balance only goes up to 7 or 8 pounds per single spring per side. I have one more window to repair but this window weighs 23 pounds. Can you help me find the right set-up?

For the 8 windows I've already repaired, I used the 15-140 coil balance shoe with 15-143, 144, and 145 parts along with the series 150 coil balance.

Thank you! Bob
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Casey from SWISCO responded:
February 1, 2024

I'm happy to hear that your repairs have gone smoothly so far! For your 23-pound says, I would recommend using two S150-6 coil springs on each side. 
Coil Balance Shoe
Coil Balance Shoe
15-140
$3.07
Coil Bushing
Coil Bushing
15-143
$0.97
Coil Bushing Cap
Coil Bushing Cap
15-144
$0.70
Coil Support Barrel
Coil Support Barrel
15-145
$0.49
6 lb Series 150 Coil Balance
6 lb Series 150 Coil Balance
S150-6
$6.59
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