Coil spring balance for certainteed windows

A contractor from Fort Worth , Texas says:
The coil is 3/4 inches wide and the lower pane is approximately 20 lbs
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Bob from SWISCO responded:

See our 15-192 Pivot Shoe. This shoe uses our Series 170 and Series 171 Coil Balances. The video below goes into more details. 

SWISCO S170 and S171 Coil Balance Assembly
SWISCO S170 and S171 Coil Balance Assembly
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