I bought a second Zwo ADC because the first one fell and broke. I tried it last night, but it couldn't correct the total dispersion effect, even though my ADC was parallel to the horizon (I turned it 180° in the other direction, but the same problem persisted). I disassembled my ADC and removed the lever of the first prism, and when I rotated the prism, I was surprised to find another hole where I could attach my lever. How do I know the correct setting? I believe the second prism also has a second hole

Thanks.
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