For more convenient use of masking tape or duct tape, there are special tapes with a knife, not giving to the same after use to stick the remaining end. In the absence of such a device to protect the end of the tape from sticking will help plastic or waxed paper valve sticker.
Recommend to read
COMPASS — DRILL ASSISTANT
If you need to drill through wall, out the other side exactly in the right place — use...a compass. Of course, in collaboration with the magnet, which should be put behind the wall...
MICROSCOPE FROM A DROP OF WATER
Probably unlikely pharmacist Leeuwenhoek invented the microscope, not whether it is a variety of lenses. In our time, for those who want to make a microscope, may be more difficult:...
