Something that helps when learning stone sharpening (wetstone or oilstone or even cheap chinese drystone haha) is a selection of coins. Find one that is the right thickeness (or two stacked - I used to use the old 20c fat coin) and leave on the end of the stone. At the start of each pass place the back of the knife on the same part of the coin and set your sharpening angle again. It does help as a rough and ready guide...
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