Window Balance Part

A home owner from KY says:
February 8, 2021
Hi, I need to replace the window balance for MFG code MTL-3 3 Euro Window.
See attached photo.
Where can I find this replacement part?

Thanks,
Debbie
Thumbnail of the uploaded file named window balance.jpg
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Bob from SWISCO responded:
February 10, 2021

Hey Debbie. This looks like a 15-180 Pivot Shoe, which uses our Series 190 Coil Balances. Let me know if you have any further questions. 
A home owner from KY says:
February 10, 2021
Hi Bob,
Thank you so much!!!
On the Series 190 coil balances,"Before you pick one of the options below, please refer to the stamp or imprint on your original spring. That should tell you what you need. If you're still not sure, or if you have no stamp, you can ask our experts for help here."
I don't see a stamp or imprint on the spring so which one do I need, 440 540 640 740 840 940?

Thanks again,

Thank you so much!
Profile picture of Bob
Bob from SWISCO responded:
February 10, 2021

Hey Debbie. if there's no stamp on the spring, the best thing to do is to obtain the exact weight of the window sash that these balances support. You can simply place the sash on a bathroom scale to obtain this weight. Give me that exact measurement, and I can work out the spring weights you need. 
740 S190 Coil Balance Spring
740 S190 Coil Balance Spring
S190-740
$9.74
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
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