A handy person from Seattle, WAsh says:
I have two channel balances to replace. They are 9/16" so are 1/2" and marked as "25 3 FK CALDWELL".
Top looks like 19-005 but I do not see a bottom that matches.
Thanks Chuck
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Paul from SWISCO responded:
Good morning, Chuck.

If you're having difficulty identifying the bottom shoe, take a few quick photos and upload them so we can take a look. You can also submit some photos of what you've identified as our 19-005 attachment so we can confirm that for you.

Let us know if you have any other questions.
A quick learner from Seattle says:
Can you ID the replacement balances from these photos. This is a 22 lb sash.
user submitted photo of channel balance
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Donna from SWISCO responded:
Hi Chuck,

It looks like your balance has our 15-004 shoe and our 19-005 top, see S385-26.

Based on the weight of your sash, we have determined you will need the stamp option 2540 which can handle sash weights between 19 and 25lbs.

Let me know if you have any further questions.
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