Window spring

Question

I do not know the brand of window but this is from the right side. I would like to purchase right and left side to replace the broken one and keep a set for spare.

User submitted photos of a window balance.

Tom · Accepted Answer

It's hard to make out what you have, but see our 15-177 pivot shoe and Series 152 spring. I think these may match. Look them over and let me know what you think. These can work on either side of the window.