Channel Balance

A quick learner from 85262 says:
I need to replace a channel balance with markings: 27 4 AV CMC 1. Thank you.
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Lauren from SWISCO responded:

Hello, thank you for posting,

It appears you have either our Series 351, with a 15-002 bottom attachment, or Series 390, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. The length of the metal channel excluding the nylon attachments should measure 28" long and you will need a 2740 stamp option.

Please review and let me know if you have any additional questions! 

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.

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