Window parts to simonton windows.

Hello, thank you for posting, 

To further review for a replacement, we will need to see pictures of the pivot shoe that the coils attach to. Thank you! 

Thank you for the additional pictures,

Your assembly resembles an older Simonton balance that is no longer made. We recommend converting to the 15-259 pivot shoe and Series 159 coils springs as a replacement. Please review the step by step video below regarding the conversion and additional products needed. Let me know if you have any questions. 

Hello!

The Series 159 coil springs are measured and can hold .5 pound increments. 

You have two options for a 20 pound sash weight. First option you could use (1) 10.5 lb S159-10 on each side of the window to equal 21 pounds. The extra pound should not be an issue, but later down the line you may find the window is a little harder to close.

Second option, is doubling up the coils and using (1) 4.5 lb S159-4 and (1) 5.5 lb S159-5 on each side of the window to equal 20 pounds. 

For the 30 pound sash, we suggest using (2) 7.5 pounds coils S159-7 on each side of the window to equal 30 pounds. 

Please let me know if you have any additional questions.