To hold the centerline on the workpiece will help the device shown in the figure.
Recommend to read
NO BUTTONS, NO SWITCHES
The proposed indicator allows you to capture voltage of 6 — 12V (i.e., below the ignition of the neon lamp) and above. In contrast to the known similar kind of indicators, there are no...
NAILS -SAFER
Unneeded hole in the wooden partition or details it is easy to putty. However, such a tube may eventually shrink or crack and fall out. This does not happen, if before applying the...