If you cut the old metal pipe of large diameter to be sawn along, and then riveted with their convex sides to each other, get both and convenient stand for pens, brushes, pens, and heavy-duty clamp, easily holding even the old electric roller blind.
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If the bolt is of metal parts does not imply further (if necessary), disassembly, Assembly reliability can be provided without a locknut, on the proposed simple technology. For this...
