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should read.....
I could just as easily have said "imagine you are peering through that piece of polypipe perpendicularly down at an oval cardboard cut out that is fixed at 90 degrees (with regard to its' radial axis.) As I'm sure you realize, the sec holder has the sec mirror fixed to it at an angle of 45 degrees.
This emboldened bit above should have read "45 degrees ( with regard to its' radial axis and the palm of your hand)"
Cheers, Darryl.
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