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I drew a template on flute panel (image #1) a while ago to help me eyeball those reflections on my C11. The issue is to keep your eye inline with the primary axis so having this board with a peep hole helps. All you have to do is match the larger of the two circles within 10mm of the edges of your primary. Move back and forth until you match it to the edge of your mirror. When you move side ways you'll see something like image #2. Next step is to move so you match the horizontal/vertical lines both in the primary reflection and in the secondary reflection in the primary. From there if you're off (picture #3) or in the ball park (picture #4) is pretty easy to visualise. What's good about this system is that it is repeatable and you can place your eyeball pretty much in the same spot every time. HTH.
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