New window coil balances for Certainteed window

Hello,

We'd be happy to help but we would need to see the pivot shoe and coils of your assembly removed from the window to compare to our inventory. We'll relate a few videos to assist you with the process. Thank you!

Thanks for getting back to us. It looks like you have an old-style Certainteed coil balance assembly. We do offer the new-style 15-192 Certainteed pivot shoe but past customers have reported that they needed to shave the front of the shoe down to install it in their window jamb. 

We also offer a conversions video shown below that works for Certainteed coil balances, as well as Simonton. Take a look and review the full process below. 

There are no written instructions for this process but you would take a utility knife and carefully shave off a little bit at a time until the shoe fits snugly in the window jamb. I would also recommend trying to install it before making any modifications in case it fits as is. 

To determine the correct strength option without the coil stamps, you'll need to remove and weight the window sash. Then, you' ll divide the total weight by the number of coils used on both sides of the window, which will give you the necessary strength option. 

You would weigh the sash on a standard bathroom scale to confirm the exact weight in pounds. For a sash just shy of 7 pounds, I would recommend using one of the S170-263 on each side of the window. 

I actually suspect that you originally had one coil on each side and when the coil broken, it seperated into two pieces. I also only see one 15-156 spring cover, which would indicate that you only had one coil. 

Regardless, you can use one coil on each side to support the sash weight you've provided. The number of coils isn't important as long as the strength options will support the sash weight when added together. Hope this helps. 

The rule of thumb with coil balances is that as long as the total support is within one pound of the exact sash weight, the window will function properly. Using one S170-407 on each side would support 14-pounds while using the S170-408 will support 16-pounds. Since both springs are strong enough to support within 1 pound of your actual sash weight, either option should work for your repair.