Need to replace both left/right side. There are no names/markings.

Home Owner from Stratham, NH

Aug 2, 2026 3:38 pm

Shoe and coil support are both 1 1/4" wide. shoe is 1 1/2" tall. coil support is 1 3/8" tall. coil is 1/2". Window weighs 18 lbs. Window size is 25 1/2" wide x 26 1/2" high. Lower window. Double hung unit.Tilt.

5 user uploaded images

4 Replies

Bob from SWISCO

Aug 3, 2026 2:37 am

Thanks for posting. See the 15-177 Pivot Shoe and Series 152 Coil balance springs. For an 18 pound sash, use two of the S152-9 9 pound springs, one for each side. For new coil housing, see the 15-143, 15-144 and 15-145 parts that 'sandwich' around each coil. Let us know if you have questions.

Home Owner from Stratham, NH

Aug 3, 2026 8:21 am

Thanks for your reply Bob. First time doing this project. Do I need all 3 parts to complete the coil housing, 15-143 / 15-144 / 15-145? Also, could I use 15-150S 1/2" coil support as well? What about just a coil replacement if some of my windows balance shoes and coil support are in good shape? Thank you.

Bob from SWISCO

Aug 6, 2026 12:43 am

Hey again. This coil system is modular, so you only need to replace what is broken. If your old coil housing is undamaged, you should be fine giving it another go. I would not use the 15-150S-- while it's meant for 1/2" thick coil springs, it's for a different coil spring series and I have some doubts the Series 152 would fit. Let us know if you have further questions.