My classy aperture stops, made from Baskin-Robbins ice cream containers (which fit snugly over the aperture of the Mak). Insides painted flat black to reduce reflections.
I find vanilla works best.
I never used the larger stop. The extra hole in the smaller one is because I first cut a centered hole, then remembered the Mak's large secondary would block it (duh!) and I needed an off-axis stop. So I covered the first hole with gaffer's tape.
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