coil balance

A contractor from 21811 says:
August 19, 2020
I have enclosed pics of all sides. The only mark is a m or 3 on back of balance shoe
Thumbnail of the uploaded file named webcam-8/19/2020, 10:56:01 AM.png
Thumbnail of the uploaded file named webcam-8/19/2020, 10:56:26 AM.png
Thumbnail of the uploaded file named webcam-8/19/2020, 10:56:40 AM.png
Thumbnail of the uploaded file named webcam-8/19/2020, 10:57:06 AM.png
Profile picture of Bob
Bob from SWISCO responded:
August 24, 2020

This looks like our 15-180 Pivot Shoe, which uses our Series 190 Coil Balances along with a support clip like the 15-181. To know what spring weights you should select, give us the exact weight of your window sash, and we'll do the math to work it out for you. 
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
Double Support Detent Clip
Double Support Detent Clip
15-181
$6.17
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