Coil Balance ID

A home owner from NJ says:
Hi this is an Anderson double hung window I need both sides
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Bob from SWISCO responded:

This looks like a 15-087 Coil Balance Shoe. This system uses our Series 180 Coil Springs. Look for a stamp code on the spring tape that designated the spring weights you need. If there is none, or you are uncertain, obtain the exact weight of your window sash. Give us that exact weight and we can work out what you need.

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