Need window coil springs

A contractor from Michigan says:
It's for a Certainteed Window The Pringle's shoe does have any visible numbers on it but it is pictured. The Spring corner says H8637MXX, the roller or retainer behind it say H8638MXX. The spring coil has the #500 printed on it. It a good size window bottom sash is 35 7/8 x 32 1/16. Another question is do you have a diagram of how it all goes back together. Also. It's always the right side spring that breaks I probably have five or six windows that need the right side springs, should I be doing both sides?
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Bob from SWISCO responded:

Thanks for posting. The pivot shoe looks like our 15-192. This is compatible with Series 170 and Series 171 Coil Springs. The Series 171 is used if you have more than one coil on each side of the window. It has a longer tongue to reach around the Series 170 and attach to the pivot shoe. Please note that our Series 170 and Series 171 attach with only one screw apiece. I'm not certain if the '500' you cite is a relevant number. However, I think in general it would be best to weigh the window sash to obtain the exact weight you need to support. The reason I ask this is because I'm wondering if one of the reason one side of your coil balances keeps breaking is because the spring weight support is uneven on both sides of the sash. If you give us the exact weight of your sash, we should be able to tell you what you need.

A contractor from Michigan says:
The bottom sash weighs 20 pounds
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Bob from SWISCO responded:

Thanks for getting back to me. If the sash weighs 20 lbs, then the best set up would be a S170-405 and S171-405 on both sides of the sash. Both of these coil springs are for 5 lbs of support. This equals 10 lbs of support on both sides of the sash, for a total amount of 20 lbs of support. Let me know what you think. 

A contractor from Michigan says:
Bob would you be able to provide directions on how to install them being two springs each side. It has two now but most are broke
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Bob from SWISCO responded:

First, attach the coil springs to the pivot shoe. Then put the covers on. Once everything is fully assembled, feed the entire coil balance system into the cutout, shoe first. Let us know if you have any other questions.

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