Constant Force Balance Replacement

A home owner from Virginia Beach, VA says:
November 20, 2016
There are no markings on my two balances except for a number 5 stamped on the spring coil. The balances seem to be functioning fine but they won't hold the window sash up, the sash always drifts back down slowly. I don't know what brand the window is.
User submitted image of their window hardware.
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Paul from SWISCO responded:
November 21, 2016
It sounds like the springs aren't strong enough. Take a look at our 1/2" thick S160-6, this may fix your issue. Each of these springs can carry 6 pounds each, as opposed to the 5 pounds your current spring can carry.
A home owner from Virginia Beach, VA says:
November 27, 2016
Received the springs on Friday, unfortunately they didn't work. The window was drifting still. I'll need to send these back and order a stronger pair.
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Tom from SWISCO responded:
November 30, 2016
Do you know the exact weight of your sash? That's probably the issue. Once you know how heavy your sash is you can be 100% sure what strength spring will work.
6.5 lbs Series 160 Coil Balance
6.5 lbs Series 160 Coil Balance
S160-06
$4.85
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