To secure the various parts often used connection, using the so-called lock nuts. However, you can do without it. For this it is necessary to saw through the nut, as shown, and tightening it slightly to hit with a hammer.
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Clutch pencil, calculated on a fat pencil, can find unexpected applications. For example, help in cases when a small screw you need to tighten in tight spaces; turn into a ballpoint pen,...