If you don't know the angle the magic marker routine will tell you. I find that a good angle to use on pocket knives is between 17 and 20 degrees. It depends on what you're going to be doing with the knife and the kind of steel the blade is. Hope this helps.
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"Better to reign in Hell, than serve in Heav'n"
John Milton
There are only two types of people; those who understand this, and those who think they do.