Balancers for American Craftsman 50 series window

Question

Hello. Need 2 shoes/balancers and 2 springs for American Craftsman 50 series window. Including photo from serial tag and photos of one balancer and spring removed. I have more photos if needed. Reached your photo max. Spring has stamp "780" or "7B0". Hard to read. No marking on balancer/shoe. Thank You

Bob · Accepted Answer

Hey there. This looks like a 15-087 Pivot Shoe, which works with Series 180 Coil balance springs sold separately. That '7' stamp likely means you can use the S180-07 7 pound springs. If you want to be safe though, weigh the window sash that these springs support. Give me that exact weight and I can calculate the spring weights you need.

Series 180 coil balance diagram