If the angular groove in the part requires the processing of a triangular file, but only one side with a notch (nearby to not participate in it), tape it temporarily any adhesive tape (e.g. Scotch tape or duct tape).
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When the need arises to make a concrete column or some other vertical structural element, for fastening the boards of a timbering used a variety of means at hand: wire, nails, all kinds...
