Spiral balance question

A handy person from Las Vegas, NV says:
Based on what I can see it looks like our single hung window with your 17-052 #63 type of bottom sash clips. The spiral balances are not connected, dropped down in the track loose. If I follow your directions "while someone holds the sash in the open position, spin the spiral up to the bottom of the sash. Finally, with our 75-004 tool, give the balance about three turns to charge it and lock it to the end into the sash clip." what keeps it in place, the power spring itself or can you describe or offer a video on how to "lock it" in to the sash clip please? Thank you
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Paul from SWISCO responded:

Perhaps I can help. With the sash in the up position, bring the spiral up to it. Hook on the charging tool, our 75-005, and give the spiral about three turns. You should feel the tension build as you turn the spiral. You need to remember, when charging the spiral, you do it as close as possible to the balance tube end.

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