Searching for 17 inch channel balance block and tackle knifes edge

A quick learner says:
September 11, 2022
17 Inch long block and tackle window balance with knifes edge clip attached. The balance has a 16 stamped on the front with no letter. The pictures will show that. There is no model number written on the balance anywhere. I will need 12 of these total. 4 for each double hung set. for 3 double hung windows. All balances have the same 16 stamped on them.

It goes into a vinyl channel. Picture also attached.

One other thing, i bent the metal clip that the channel guide clips into. Do you sell replacement clips? it's 3-3/8 inch's wide.
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Tom from SWISCO responded:
September 14, 2022

Thanks for reaching out to us! The design of your balance closely matches our S751-17. I think this may be just the part you need but look it over and see what you think.

Since your balance has no stamp on it, you won't be able to determine what weight calibration you need without weighing your sash on a scale. That should be your next step. Once you have an exact weight you can check the chart on the S751-17 store page to confirm the best option.

As for that metal clip, I've unfortunately never encountered this before. Can you confirm what it does, exactly? 
17" Series 751 Channel Balance
17" Series 751 Channel Balance
S751-17
$10.45
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