Mastic channel balance.

A quick learner from Wenonah, NJ says:
I order the part for mastic window, the channel part, S670-21 but when i put it in the wondow just closes, its too loose. It wont stay open
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Tom from SWISCO responded:
It sounds like you didn't charge it when you installed it. Spiral balances like our Series 670 have to be wound up a few times during installation so that it acquires the proper tension. You can use a tool like our 75-006. See the guide below for further instruction.
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