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Where is spiral balance to be installed top or bottom hole

A quick learner from USA says:
Where is spiral balance to be installed top or bottom hole
User submitted a photo of window hardware.
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Tom from SWISCO responded:
Hello! I'm actually not sure. There should be only one hole. I wonder if the original installers had an improperly sized balance and drilled another one. Your best bet would probably be to experiment with each one to see how well they accommodate your replacement balances.
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