I have 14″ plane, I assume maybe a jointer plane, and wonder what the purpose might be for the holes. Assuming this is indeed a jointer plane I screwed a to the side so that it could be used to guide the plane so the resultant edge of the planed board would be a true right angle. Since the blade does not meet the edge of the plane it would be easy to skew the plane to trim the edge of the board by holding the edge of wooden guide against the board to be trued. The guide board meets the bottom of the plane at right angles.
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