There are many ways to keep a ladder from slipping. The easiest “put on” her old sneakers or shoes with a rubber sole.
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UNIVERSAL INDICATOR
Two LEDs with different color (e.g., red and green), you can build a simple indicator for voltages from 4.5 to 220 V. It is also able to determine the polarity of the source in the range...
WHEN BROKE OFF THE SCREW…
Hard turns (as, indeed, trudnosmyvaemye) fastener (screw or stud) face many troubles, both small and large. The latter can be safely attributed the breakage in the body parts of the stud...
