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If I simply use my fingers as a set of pseudo-dividers, I believe that your guide cam is actually spaced too far out, literally by the length of that spacer you have there.
When I used an OAG, I used an helical eyepiece holder as my spacer - just move the guide cam up and down till focus, then lock it in. Makes the job 1000x easier than trying to guess a fixed spacer.
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