Slide Up/Window (2001) coil balance

Hello,

We can't be sure with your balance still installed but your balance system seems to use the 15-180 pivot shoe, which uses the single 15-186 or double 15-181 support, 15-182 spring bushings, and S190 coil springs. There should be a code stamped on the springs you'll need to choose the corresponding strength options. If you're concerned that they are not calibrated properly, you can also weigh the window sashes. The sash weight divided by the number of coil springs used on both sides will confirm the strength options needed for your replacements. Thank you! 

Alternate image for 15-180