Spiral Window Balance Installation

A quick learner from Royersford, PA says:
I ordered 4 spiral window balances. Are they basically bolt on? Or do I have to apply tension to the balances prior to attaching to the pivot shoes?

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Tom from SWISCO responded:
Thanks for posting, Eric. I see you have purchased our S900-33. I think you should take a look at our handy tutorial video on how to install a tilt-window spiral balance. This should answer any questions you may have.
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