Window block and tackle

A quick learner from Washington State says:
25 3 LO CALDWELL
User submitted photos of a window balance.
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Casey from SWISCO responded:
Thanks for the detailed photos. I believe the best match for you would be our S385-26 channel balance. Take a closer look and let me know if you agree.
A quick learner from Washington says:
That looks like a match. Judging from the stamp on mine I guessing that the 2530 option would be the correct one. Your opinion?
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Tom from SWISCO responded:
That sounds right, but you can weigh your window sash to be sure.
A quick learner from Washington says:
Just installed the new parts. Super easy with the help of the video. Fit perfect and working as designed.
Thanks
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