To hold the centerline on the workpiece will help the device shown in the figure.
Recommend to read
SNAKE IN THE POCKET
What a pleasure to start the thread right under the clouds even a simple crossing of two strips, covered with tissue paper! But in our time it is available only to inhabitants of rural...
DRILL-BABY
The construction of any model is unthinkable without cutting in detail dozens of holes in the first place is quite small, with a diameter of less than 1 mm. you Buy such a drill, of...