When drilling holes in vertical parts or concrete wall is not so easy to demonstrate the accuracy and not to make a mess. However, this method makes it easy to solve this problem. Take any flat jar with lid — e.g. an empty box from under the Shoe-Polish, — and pressed her to the wall, start by drilling a hole through it: throw away all drill dust will be inside the jar.
Recommend to read
THE WATCHMAN AND ILLUMINATOR
As you know, the greater the number of elements in the design, so it is less reliable. To increase the reliability of electronic devices and selection circuitry. This will be the...
ATLANTA ELECTRICAL CIRCUITS
Who used a portable transistor radio, know how, over time, decrease the sensitivity and loudness of the radio, begins to "float" the rate of advance of the tape in the music player... ...
