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Old 12-02-2009, 06:31 PM   #6
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Default a quick picture ...

Black is the inner edge of the U shaped card template, the bottom edges of the card obviously sit on the base, level with the face of the prop hub...
Brown hatched area is the notional prop blade

Red lines indicate where the ruler sat on the blade and had a line marked at either end
Green lines show how the template is created on card...join the dots stuff. Its quite surprisingly accurate with only a dozen or so lines!

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