Window Single hung

Your pivot shoe looks like an older version of our 15-180, which means you can use our Series 190 to repair your balance setup. 

If there are no stamps on the original spring, then you'll need to weigh your sash on a scale to determine the proper Series 190 strength option.

Thanks for confirming. Since you only have one spring per side, that means they're probably rated to hold 10 pounds each. We unfortunately don't have a Series 190 that can hold that kind of weight, though. The heaviest we can offer is the S190-940, which carries 9 pounds. That's too weak.

A better solution is to bump up to using two springs per side; specifically the S190-540, which carries 5 pounds. Using four 5 pound springs will give you 20 pounds of support no problem.

You would also need a new clip, since your original clip is only designed to hold one spring. See our 15-181 double spring clip and our 15-182 balance bushing.

Great! All orders can be placed on our site at your convenience. Let me know if you had any other questions.

I assumed your old spring was broken, so you would still need to buy them, yes. Otherwise there'd be no point in getting the 15-181 and 15-182 to begin with.