Homemade odometer

Gash on the sandpaper (manual winepress) bumps on both sides of it. Then the gramophone needle to punch a hole in the center of the disc. Center found by imposing on paper disk with a marked center circle radius of 12.2 mm. When piercing a needle through the cork is better to skip. Next, the markings on one side of the disc. It can be applied directly on the disc (chisel), or pre-causing division on paper, then copy to disc. In the first case of numbers (from 1 to 8) is better than to knock directly on the disc. Disc is inserted into the handle on the ASI and strengthened. In the pen is better to make drunk to drive fret. The initial mark will figure 8. Tsifrovku applied in a clockwise direction. To odometer could fasten a button pocket or strap tablet pen in the hole makes a loop.