Coil Balance inquiry

Question

My dad has windows in his house that are 50 years old the coil balances broken how do I know what lb.to get. His windows are aluminum double pane. The coil hooks on top the window and the coil is attached to the top frame. I could not find any markings on the spring coil. Although after 50 years of use. I attached photos of the spring and housing and hook.

User submitted photos of a coil balance.

Paul · Accepted Answer

Seeing as how your window is 50 years old, I believe you have a wood window with coil springs. If that is correct, I'll try to to help you. Can you weigh the sash using a bathroom scale? That would help us determine what strength spring you need.