To not have suffered a carpeted floor from the wheels in the extension part folding sofa placed under them, the two grooves from a plastic version of the window blind: even after long time use of wheels does not remain any traces. L. STORCHEVOY
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IMPROMPTU FUNNEL
If you need to pour the liquid from the jar into a container with a narrow neck and a funnel on hand that can be use inverted lid with a hole from a teapot or sugar bowl. R. MOROSIN, Vologda
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...
