What do you use to charge a balance?

A quick learner from Pennsylvania says:
In your notes you say the spiral balances are shipped ready to be charged. What do they need to be charged with?
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Tom from SWISCO responded:
I see you were looking at our S900-36, which is for tilt windows. We recommend our 75-006 charging tool for tilt window spiral balances.
How to replace a tilt window spiral balance.
How to replace a tilt window spiral balance.
VIDEO
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How to Identify a Replacement Spiral Balance
How to Identify a Replacement Spiral Balance
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How to adjust a spiral balance on a tilt window
How to adjust a spiral balance on a tilt window
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How to choose the proper spiral balance tip color
How to choose the proper spiral balance tip color
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