window coil balance with shoe

Thanks for posting. This is likely a 15-087 Pivot Shoe, but make sure the width and thickness listed below match. If so, this shoe uses Series 180 Coil Balances. Yes, if the window sash weighs exactly 18 pounds, use the S180-9 9 pound springs, one for each side of the sash. Let me know if you have other questions.

Detail of 15-087

Series 180 coil balance diagram

These components unfortunately do not come assembled, but the good news is that it's very easy. The 15-087 carrier simply snaps apart into two pieces. You then put the spring inside and snap it back together.