Replacement block and tackle balance spring for AMSCO tilt sash double hung windows.

THIS SPRING WILL NOT WORK FOR SIDE LOAD SASH PRODUCTS. (If your window cannot be tilted in it is a side load window.)

To order the correct size spring, find the numbers stamped on the body of your existing spring. There will be a two digit number followed by a letter. (##A) The number indicates the spring length(i.e. 18A is an 18-inch spring) the letter indicates the spring weight (i.e. 18A is an 18-inch spring with a spring strength of A)

For instructions on replacement please view our YouTube video:

Click here for our YouTube instruction video.