single hung bathroom window

Thanks for posting. This is a 15-180 Pivot Shoe, which works with Series 190 Coil Balances. Confirm the exact weight of the sash. A bathroom scale should suffice. If it weighs exactly 10 pounds, then two of the S190-540 5 pound springs, one on each side of the sash, would work for replacements. Let me know if you have further questions or concerns.