Coil balance for windows

A home owner from Southbridge MA says:
We are looking for a replacement part for this unit as it has broken. It is located on both the left and right side of window. On the center of the plastic is a 2
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Bob from SWISCO responded:

Thanks for posting. See our 15-155 Pivot Shoe to start. Compare with your old shoe and see if you think it matches. This shoe is compatible with our Series 170 an Series 171 Coil Springs. The Series 170 is used for the bottom coil spring on each side of the sash, while the Series 171 sits on top since it has a longer tongue to reach down to the shoe past the first spring. Look for stamps on your old coil springs to see what spring weights you need. Let us know if you have any questions.

A home owner from Southbridge MA says:
Thank you for your help. This is the part needed and an order has been placed.
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Bob from SWISCO responded:

Glad I could help! Let us know if you have any other questions. 

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