To hold the centerline on the workpiece will help the device shown in the figure.
Recommend to read
IF THERE IS NO NEEDLE
If you do not have a special needle for inflating nipple of a volleyball or soccer ball, take advantage of... ordinary medicine dropper with an elongated spout. Rubber part is a bit cut...
THE BALL INDICATOR
If, during the filling of high capacity water (e.g. drums) intended for watering the garden, throwing a rubber ball of small size, its appearance over the edge of prompts to close the...
