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Plant two nails at the same height.

Often when I hang a painting or a shelf on the wall, I need to place several nails exactly at the same height. Rather than repeat it several times by puncturing the wall until it fell perfectly straight, I found a very practical method. I plant the first nail, I hang a string that I tend to horizontal and I stretch this string and I hang at the end of the second nail. I position my second nail right in front of the first and I make sure with a spirit level that the string is perfectly plumb.

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Video Instruction: Place 2 Nails Beside Your Plants And See What Happens