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The holes on the Intake, header, and head are larger to accommodate 4x2mm disc magnets. I used 8 for the header, 4 for each mating face. And I used 14 for the intake, 7 on each face. This allows you to easily remove both and see inside the ports if you printed the ported version. The magnets we epoxied into both faces at the same time to produce an even mating surface for the magnets, separating them with painters tape,