Coil balance spring

Question

I have several windows 28.5"(H)x33.25"(w) with coil balances. To help me purchase the right coil balance set on your website, I have a few questions:

Double Support Detent Clip (15-181) - It matches what I have from picture. Does it come with different measures or only one kind?

There are two Coil Balance Springs on the website (S190-740 and S190-540) - on my spring, I saw a stamp #6. Can you let me know which spring I should purchase?

Thank you for you help!

Paul · Accepted Answer

The 15-181 double detent is for two coil springs, and 15-186 is for one. They don't come in any other size. If your coil spring is marked 6, then go with S190-640. I hope that helps.