Block and tackle

A quick learner from grapevine tx says:
July 11, 2023

I'm trying to identify this block and tackle and see if you have it. the string end hooks into the block in the jamb. It is marked U B 26C. The blocks is good I need the block and tackle's only. The block and tackle measures 27"

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Casey from SWISCO responded:
July 12, 2023

Hello,

Take a look and compare the specifications of the S770-27 channel balance to yours. The 26C stamp code would normally indicate that the metal channel would measure 26" long. If yours measures 27", you'll need to weigh your sash to determine which option you'll need. There is a chart on the product page that explains how to choose your option based on the sash weight. Thanks for posting. 
27" Series 770 Balance
27" Series 770 Balance
S770-27
$12.70
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