Window balance kit

A contractor from North Myrtle beach says:
Coil balance kit and locks
And is there a trick on replacing them
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Casey from SWISCO responded:

Hi there, thanks for the inquiry. To start with the keeper, look over our 90-237 . For the coil balance system, it appears you have the 15-111 pivot shoe which is compatible with the Series 160 coil balance. You'll need to check the tongue of the coil for a stamped number to determine the correct option. If yours doesn't have a number, just weigh the window sash to see which option your window falls into. Let me know if you need any further clarification. 

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