Coil balance

A handy person from Brooklyn says:
The coil balance that i order (S160-5) don't fit with the coil single support (15-150S).
In the photo you can see that the coil balance don't go inside the single support. I need a bigger coil balance.
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Tom from SWISCO responded:

The 15-150S cover doesn't work like that. That bump doesn't go through the coil, it holds it from underneath. 

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