Window will not stay open

A quick learner says:
26 5 JW CMC 11 balancer numbers

My measurement is 27" length
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Bob from SWISCO responded:

Thanks for writing in. See our S380-27 or S385-27. The only difference between these two balances is the 'depth' of the bottom nylon shoe, so compare both with your old hardware to see what matches best. You will need a stamp option of 2650. 

A quick learner says:
I am doing 2 windows. I would like to order S385-27. I would order four channel balances. It appars that the shoe & the top are connected to the balance. Is this correct?

I am not clear with "stamp option of 2650"?

Thank you,
maria
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Bob from SWISCO responded:

The 2650 stamping indicates that the spring will support a sash weight range of 26-30 pounds. 

A quick learner says:
Thank you Bob. I will submit my order.
maria
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Paul from SWISCO responded:

Sounds great, Maria. Please be sure and get back to us and let us know how everything works out.

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