SWISCO - The Replacement Hardware Authority

coil balance help

A handy person from West Virginia says:
The window I am working 0on has 2 springs that both attach to what appears to be your 15-150 standard support. One mounted directly above the other. One spring is 3.5 pound and the other is 5.5 pound. The video on your site only shows installation of a single spring unit. Should I change over the window to your double carrier and what is the best configuration of spring weight 3.5 on top or 5.5.

Specifically,
1. Can I use the 15-150D on the window?
2. Does it matter which spring is placed where? 3.5 on top or 5.5 on top?
3. I assume I would be buying 2-3.5 and 2-5.5 pound springs to replace both sides.
4. One of the broken springs shows that they are 33" your site sells 35" will the different length present any serious issues regards closing properly?
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Paul from SWISCO responded:
If you have an S160-3 and S160-5, I recommend the 15-150D coil housing. I would install the S160-5 first with S160-3 on top. You would buy two coils for each side. The 35" length will work in place of the 33" coil spring length.
A handy person says:
Very helpful and fully informing to my questions, a very good response and I really appreciate your taking the time to help me.
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Paul from SWISCO responded:
It was my pleasure. If you need anything else, please let me know!
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