replacement spring ballast

Question

Hello.

Trying to find a replacement spring ballast for my mother-in-law's double-hung window. Measurements of the old ballast are: 1 1/4" wide; 1/2" deep, as close as she can figure. Cannot find a manufacturer. Enclosing picture of label in the window with some identifying numbers, also separate pix of the ballast (top & bottom) still in the window. The problem with the piece is that the U-shaped metal piece has broken.

Hope you can help us out with an appropriate part. Thank you.

--Bob

Rochester, NY

Emily · Accepted Answer

Hi there Bob.

The 15-177 is the pivot shoe I recommend. For new springs, see the S152 which are sold separately. You'll want to check the spring tongue for a stamped weight code as well. If there isn't one, you'll have to divide the sash weight by the total number of springs in the window.