For those unfamiliar with this little time-saving trick from David Charlesworth look here. This is a great device for old plane irons that can have backs almost impossible to flatten. Do beware, some of the demonstrations on the web show rulers that are too thick. What you want for this trick is a cheap ruler that is only 0.020″ thick and no more. It is just another device that make sharpening quick. And that is the object. Get your tool sharpened as quickly as possible and get back to woodworking.
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