Constant force balance

A landlord from East Brunswick says:
August 8, 2017
The constant balance system in my window is not functioning. The coils seem to be intact. But the plastic has decayed and broken on the shoe. Please help me identify the parts needed to fix the window. Please see attached photos.

Coil assembly
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Tom from SWISCO responded:
August 11, 2017
Thanks for your post. if the shoe is the only thing that is broken, see our 15-180. Let us know if you agree with that recommendation.
A quick learner from East Brunswick, nj says:
August 12, 2017
On one side, it appears as if only the shoe is broken. On the other side, the housing for the coils is deteriorated.

What would parts would I need to replace it? Would I need to replace the parts on both sides?
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Tom from SWISCO responded:
August 16, 2017
If the coils are broken, too, we would recommend the Series 190 coil balance. You'll need the number off the old spring to confirm the best match.

You can reuse the old shoe on one side, if it's undamaged. However, it may be a good idea to replace all the springs at the same time.
A quick learner from East Brunswick says:
August 16, 2017
The coils appear to be intact, but the housing that holds them has broken down.
A quick learner from East Brunswick, NJ says:
August 17, 2017
Hi Tom,
Perhaps I am not explaining my issue properly. One side of the track has a broken shoe, but the balance--springs, plastic housing for the springs, etc.--is intact. The other side has springs intact but has a broken shoe and a deteriorated plastic housing for the coil balance. The window sash is 20" wide by 24" high. What parts would you recommend?
Jerry
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Tom from SWISCO responded:
August 22, 2017
Well, we mentioned the 15-180 pivot shoe and Series 190 spring above. If you also need the clip that keeps the springs stabilized, see the 15-181, as well as the 15-182 drum.
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
Double Support Detent Clip
Double Support Detent Clip
15-181
$6.17
Balance Bushing
Balance Bushing
15-182
$1.80
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