Channel balance

A handy person from Chico, Ca says:
Numbers on part: 20 4 HT CMC 4

21" long metal piece, 5/8" x 1/2"
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Emily from SWISCO responded:

Hello there!

My recommendation would be our S380-21 or S385-21 channel balance. The important difference between these two parts is the depth of the bottom shoe so you'll need to measure as shown below. Based on your 20 4 stamp, you will need the 2040 spring strength option. 

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.

A handy person from Chico, Ca says:
Excellent thank you! It took a while to get back to the job, but finally measured it. It's 1 & 3/32, so I'll order the S385-21.

Thank you for being so helpful!
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Emily from SWISCO responded:

My pleasure! Let me know if you need anything else, I'd be happy to help! 

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