Newbie sharpening :)

Quarters are not a guide but a reference to the angle to use. If you buy diamonds buy DMT.
 
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also take into consideration that the quarter trick will turn out different for different knives. If you have a larger blade with more height on the blade, you'll need more quarters stacked to get the same angle than you will need on a smaller, less high blade.
You could calculate the exact corner with some trigonometry ;)
 
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