Tilt replacement window tilt/balancer

A quick learner from Lindenwold says:
See photos some have #5 and some have #6 on them. Sunny side uv Ray's kill vynal
This part helps keep window up.
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Bob from SWISCO responded:

Looks like you have a 15-087 Pivot Shoe, which uses Series 180 Coil Balances. To know what spring weights to select, give me the exact weight of the window sash that these balances support, and I can work out the rest for you. 

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