identify replacement channel balance

A home owner from San Jose, CA says:
Can you help to identify what model channel balance I should order for my single hung windows? the cord seems to have snapped. Original model number appears to be 26 5 IW CMC 11

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Bob from SWISCO responded:

I am sure we can help, but that stamp is not a model number; it simply tells us the calibration of the balance. Can you remove the balance and show us pictures of the nylon fittings on both ends of the metal channel? That would help narrow things down. Many thanks. 

A home owner from San Jose, CA says:
thanks for responding. these two pictures should show what you are asking for
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Bob from SWISCO responded:

Thanks. is the metal channel, not including the nylon fittings on both ends, 27" long? If so, seems like you need either a S380-27 or S385-27. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. See the diagram below for details. For a new stamp option, choose 2650.

S380vsS385
A home owner from San Jose, CA says:
Thank you. What about the frayed nylon cord (also pictured)? any idea how to identify the replacement part number of that?
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Bob from SWISCO responded:

That cord is part of the spring system in the channel balance. Our channel balances come fully assembled with the fittings and cord so that they're ready to install to the window out-of-the-box. Let me know if you have further questions. 

A home owner from San Jose, CA says:
Thank you! It looks like S385 is my correct choice.
I'm not sure that I understand what "new stamp option" means in this context. It's a sash weight choice, but where I'm confused is:

Does that mean that it will generally handle a normal window range, or are you getting that information off of the photos that I've sent along?
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Bob from SWISCO responded:

Let me clarify. The stamp option designates the weight range the balances are calibrated to support. Your old balances had a stamp code that included 26-5. This indicates to me you need new balances that use our equivalent stamp option of 2650, which can support a window sash in the weight range of 26 through 30 pounds. You always want the window sash's exact weight to fall within the range designated by the stamp option; otherwise the window will have difficulty opening or closing. You can always weigh your window sash to confirm this. Let me know if you have further questions. 

A home owner from San Jose, CA says:
I received the channel balances yesterday, and replaced them this morning without much difficulty at all. Thank you very much for your assistance on choosing the correct part, and for the information on how these things work. You've definitely gotten yourself a repeat customer!
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Bob from SWISCO responded:

Thanks for the kind words! Always nice to hear a good success story. Let us know whenever you need anything else, and many thanks for your business. 

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