Help with new balances

A quick learner from Cedar Rapids, IA says:
July 21, 2021
I just got the balances I ordered. Super excited to install. Looks like the screw method was used as there are no clips in my window frame. However, the plastic pieces at the bottom seem to be facing the other direction and I'm afraid of putting the new ones in and breaking them. I have images of how the old plastic pieces appeared in the window compared to the new. I hope I'm making sense.
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Paul from SWISCO responded:
July 27, 2021

Hello there. Many service technicians pull the shoe from the balance and lock the cord with locking pliers. So this means that there is play to work the knife shoe in the window track. Once you do this, bring up the balance and shoe, and then screw the balance at the top and lock the shoe in place. Let us know if you have further problems or questions. 
31" Series 751 Channel Balance
31" Series 751 Channel Balance
S751-31
$12.05
How to install a ribbed tilt channel balance with knife lock shoe
How to install a ribbed tilt channel balance with knife lock shoe
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