Simonton window coil balancer

We should be able to help, but the pivot shoe in question is obscured in your photos. In order to make a recommendation I will need you to remove the shoe in question from the window so that we can get a good look at it.

Can you also confirm the thickness of the springs while they're out? I think they'll be 3/8" but I don't know that for sure and would like to be more certain.

Perfect, thank you, Brian! This is exactly what I needed.

My recommendations will be the 15-199 pivot shoe, Series 165 coil spring, and the15-205 triple spring cover. There should be a stamp on the old coil that will allow you to pick the proper weight option. Otherwise, I'm very confident that these parts are exactly what you want.

Unfortunately getting that stamp number is necessary. Note too that there's a chance there won't be a clear stamp on the spring. If that's the case, or you are uncertain, it's best to weigh the window sash the balances support. Placing it on a bathroom scale will suffice. Give me that exact weight, and I can work out the spring weights you need. 

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Thanks for getting back to us. If the window sash weighs 24.5 pounds, I advise you use four S165-6 6 pound springs, two for each side of the window. That would give each side of the window 12 pounds of support, for an overall total of 24 pounds--being within 1 pound suffices. You can use the 15-204 Double Supports for both sides. Let me know if you have further questions. 

Your original coils were probably individually weaker springs than the S165-6 6 pound springs, which is why three were needed per side. The actual number of springs per side is not as important as covering the overall sash weight, and having symmetrical support on both sides of the sash. So using these springs as a replacement should work fine for a 24.5 pound window. As far as installation goes, see the video below that covers triple coil installations. Installing double assemblies will be very similar, if not a bit easier since there's less you need maneuver. Take a look and see what you think.