Coil Balance and Brittle Window Rails

A handy person from Colorado says:
August 12, 2015
My coil balance has a double coil. Patent number 5.353.548.
The cam does not allow the sash to be lifted out. Best I can tell, two screws must be removed from the bottom of the sash to remove the pivot arm.

Also is there any way to purchase new top and bottom rails for vinyl windows? The sun has made mine so brittle they crack with very little pressure. The spring loaded pins that hold the sash in window via the top rail are broken.
User submitted a photo of a coil balance.
Profile picture of Paul
Paul from SWISCO responded:
August 13, 2015
I suggest replacing the brittle vinyl windows with new complete windows. It is very difficult to match sash frames, and even if you know the manufacturer of the window, they change their styles constantly.

As for the balance itself, the photo looks like our 15-086 and 15-087 housings. If these are correct, I'd recommend our Series 180 coil springs, as well. You shouldn't have to unscrew the pivot bar. The sash should just twist out.
Tandem Coil Housing
Tandem Coil Housing
15-086
$1.68
Coil Housing Pivot
Coil Housing Pivot
15-087
$5.97
Mounting Bracket
Mounting Bracket
16-024
$0.66
6 lbs Series 180 Coil Balance
6 lbs Series 180 Coil Balance
S180-06
$4.45
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