crossbow balance

A home owner from Powhatan, Va. says:
we were told to order your balances to replace another kind that was in our windows which we did and have received.They look like they will work. Our question is we do not know if we should stretch them to a certain height to put the screw in or set in window as is and then put screw in. We did not receive any screws with order.
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Paul from SWISCO responded:
Hello! We actually have a video on the best method of installing our Series 850. You can see it below. As for the screw, we recommend our 33-020.
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