Coil Balance Cascade

Hello,

Your original pivot shoe was recently discontinued but the 15-177 is a confirmed replacement. This shoe works with the Series 152 coil springs. There should be numbers stamped on the base of the coils that indicate the corresponding strength options. If not, you would need to weigh the sash and divide the weight by the number of coils on both sides of the sash, which looks like it would be 4. For new coil spring covers, see the 15-143, 15-144, or 15-145. Thanks for posting! 

You should be able to reuse the original coils if they are still in good condition. Unfortunately, the letters on your coil do not correspond to any of our strength options. If you determine that you need new coil springs as well, I would recommend weighing your sash as we mentioned previously.