Pictures Of Broken Parts

Looks like you have the old Simonton brand coil balance assembly. They no longer make this, but the good news is that we have a working alternative that I've personally used on this window with success. The video below will go into more detail. This will explain exactly what parts you need to buy and how you can install them in your window. Just note that you will need the exact weight of your sash on hand in order to calculate the proper spring strength. You want to divide that weight by how many springs support the sash, then pick accordingly.

Yes, there are multiple different strengths for the Series 159 coil balance. As mentioned above, all you have to do is weigh the sash and then divide that weight by how many springs support it, then pick accordingly.

In that case you have a few options.

The first is to go with two 10.5 pound springs; one on each side. That will give you 21 pounds of total support, which is a pound over. That's a little strong, but it shouldn't be the end of the world. Just note that the windows may require marginally more effort to close than they might otherwise (about a pound's worth, which in my experience is negligible).

Alternatively, you can double up on springs and use two per side: specifically the 4.5 and the 5.5. That will give you a full 10 pounds of support on each side, which is perfect, but it will make them a little more difficult to install.

It's ultimately up to you what you want to go with.