need a few balance replacements

A quick learner from Portland, Oregon says:
September 7, 2020
I've got 3-4 wooden, double-hung windows in my house whose upper sashes slam open when I'm trying to close them.

I can't seem to figure out
a) what parts to order and
b) how I'm gonna get them back in- looks really difficult with these hooks on the upper part instead of screws.

Do I switch to screwing them in? Can you figure out what parts to order?

Thanks!
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Casey from SWISCO responded:
September 10, 2020

Hello,

This looks like our S751-21 channel balance with a 20R spring strength option. Also, see our 19-029 S-clip. 

As for installation, I'll attach our video below that will walk you through the process. Thank you!
Short S-Clip
Short S-Clip
19-029
$0.65
21" Series 751 Channel Balance
21" Series 751 Channel Balance
S751-21
$10.56
How to install a ribbed tilt channel balance with knife lock shoe
How to install a ribbed tilt channel balance with knife lock shoe
VIDEO
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Classifying Channel Balance Fittings
Classifying Channel Balance Fittings
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