Siminton window coil shoe broken

Hello there. Yes, this old Simonton Coil Balance system is no longer made, but our 15-259 Pivot Shoe and Series 159 Coil Balance springs can replace it. The video below explains how. If the window sash weighs exactly 18 pounds, use the S159-05 5.5 pound spring and S159-03 3.5 pound spring, one for each side of the sash. This will give you 9 pounds of support on either side of the sash, to equal 18 pounds of overall support. Let me know if you have further questions.

Correct! That will give you 9 pounds of support on both sides of the sash, for a total weight support of 18 pounds, which matches the sash weight. Let us know if you have further questions.