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I examine every detail of David Charlesworth's excellent video covering his Ruler Trick method for polishing the back of a plane iron.
• The Ruler Trick
Many have described the ruler trick as a method to avoid flattening the back of a plane iron. I disagree, as described my Mr. Charlesworth, it is a method to avoid polishing large portions of the iron back. In my opinion, the back must already be reasonably flat for the method to work.