In zero length adapter the the dovetail end finishes exactly where the threaded part ends for the filterwheel. So the body of the moag will sit flush against the filterwheel plate. I have the adapter for mega moag, I believe you have monster moag. The opening are the same so no problem there. Just check the guider port is fine and won't get on the way if you reduce that 2mm backfocus of current adapter. I will try to take a picture later tonight to show what I mean.
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