Emily from SWISCO responded:
December 7, 2021
Hello! It looks like you need a new coil balance. Take a look and compare our S140 coil balance assemblies to yours and see what you think. |
Emily from SWISCO responded:
December 8, 2021
The numbers stamped on the coil spring assembly represents the calibrated weight they're meant to support. Your "5+5+5" stamp suggests that you'll need the S140-15. If you're unsure, obtain the exact weight of the sash and divide that weight by the number of springs you have in the window. The S140-15 having two coils instead of three won't matter, so long as the spring weights are within a pound of your sash's actual weight. Let me know if this makes sense or if you had any questions. |