Balance spring

Thanks for posting. See our 15-177 Pivot Shoe. This shoe uses Series 152 Coil Balances. Let me know if you have further questions about this hardware.

In that case, give me the exact weight of the window sash. I should be able to work out the spring weights needed.

Thanks! I recommend using one 7 pound and one 8 pound spring per side. That will give you 15 pounds of support per side, or 30 pounds total. See our S152-7 and S152-8 for these respective weight options.