Need a book on it? Chris' HANDPLANE ESSENTIALS is available at ShopWoodworking.com.
From David Thiel, our Online Content Development Manager:
I used to think Chris Schwarz had an addiction to sharpening handplanes. I watched him spend many hours testing a variety of sharpening techniques, and we had a number of "discussions" about the value (to the finished woodworking project) of the time and energy spent on sharpening. I now realize he's just very thorough, and that the time spent was to clarify what he felt was "sharp."
I have to say this video on flattening a plane sole during hand plane restoration proves that his addiction has served him well. The technique is simple, quick and very effective. And he's also happy to recognize that there is a "flat enough" or "sharp enough." Thank you, Chris.
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