double hung tilt window triple spring replacement

A handy person from westfield, IN says:
July 25, 2014
I have a broken spring. The 140 series is very close but it appears that it would be too wide to get in. My slide slot is Wide enough but the returns only have 3/4" between them. Also how do you tell what weight to order.
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Tom from SWISCO responded:
July 25, 2014
There should be a cut out in your jamb to allow the balance to slip in. As for the weight, you will have to weigh your window sash and divide it by two. For example, if your window sash weighs 24 pounds, you will want the S140-12. Each of these balances can carry 12 pounds by themselves, so two working together can support a 24 pound sash.
A quick learner from westfield, IN says:
July 28, 2014
The original had 3 springs but the window probably weighs about 30 lbs. Not sure why they had the extra spring. Only 1 side is bad but it may be better to replace both sides so I am sure I am evenly matched.
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Tom from SWISCO responded:
July 28, 2014
Yes, it's always best to replace both sides at the same time. You should get an exact weight for your sash, as well. These are delicate systems and it's important to only get exactly what you need. Estimations are not advised.
A quick learner from westfield, IN says:
July 28, 2014
The sash only weighs 20 lbs. Why would they put a triple on that originally. I want to order a set so it seems that I would go now with the direction you gave. For a 20 lb sash, what should I order.
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Tom from SWISCO responded:
July 28, 2014
Like I said above, you would just split the weight in half. Since you have a 20 pound sash, I think our S140-10 is a good way to go. Each of these balances can hold up 10 pounds, individually.
A quick learner from westfield, IN says:
July 28, 2014
Thank you I will order a pair of S140-10
10 lb Series 140 Quick-Tilt, Single
10 lb Series 140 Quick-Tilt, Single
S140-10
$9.85
12 lb Series 140 Quick-Tilt, Dual
12 lb Series 140 Quick-Tilt, Dual
S140-12
$11.52
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