Replacement coil balance

A professional from Texas says:
October 2, 2020
I'm looking for the right coil balance for this shoe and mount, the shoe says AI-87598
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Bob from SWISCO responded:
October 6, 2020

This looks like a 15-192 Pivot Shoe, which uses our Series 170 and Series 171 Coil Balances. The video below explains more. 
A professional from Texas says:
October 13, 2020
I ordered a s170 (334) and the window sash was too heavy for that coil balance, just trying to see if you can tell me which one to order. The sash is 48in x 30in.
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Bob from SWISCO responded:
October 14, 2020

Can you give me the exact weight of the window sash? I should be able to work out the spring weights you need from there. 
CertainTeed Pivot Shoe
CertainTeed Pivot Shoe
15-192
$6.39
405 Series 171 Coiled Balance Spring, Long
405 Series 171 Coiled Balance Spring, Long
S171-405
$6.55
407 Series 170 Coiled Balance Spring
407 Series 170 Coiled Balance Spring
S170-407
$6.55
SWISCO S170 and S171 Coil Balance Assembly
SWISCO S170 and S171 Coil Balance Assembly
VIDEO
WATCH >
How to remove window pivot shoes
How to remove window pivot shoes
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Anatomy of a tilt window
Anatomy of a tilt window
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How to Replace a Triple Coil Balance System
How to Replace a Triple Coil Balance System
VIDEO
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Removing a Triple Coil Window Balance
Removing a Triple Coil Window Balance
GUIDE
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