24c and 21c rods

A quick learner says:
I'm looking to order 8 rods 24c &4 rods 21c please identify the rods
channel balance
A quick learner says:
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Paul from SWISCO responded:
If you have 3/8" channel balances, I believe you can use our Series 810 balance (with a 15-077 bottom fitting and 19-023 top fitting). In that case, you will need the S810-25 with a spring weight of 24C, and S810-22 with a spring weight of 21C.
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