When you need to hammer a nail near the ledge of the wooden parts, then there is always the danger of damaging it. However, this will not happen if you use any metal or plastic strip installed between the nail and the ledge, it will send the hammer and protects the edge of the part.
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When performing masonry great aesthetic importance is the jointing. Use to perform this operation cut tube Ø 10— 12 mm by bending it as shown in the figure.