Coil balance

A quick learner from Ilinois says:
Stamped with an 8 looks like half inch wide.
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Tom from SWISCO responded:

This looks like a match for our Series 160 spring, but we don't have an 8 pound version. I recommend using two 4 pound versions, which would be our S160-4. That also means you need a new 15-150D double spring cover.

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