To hold the centerline on the workpiece will help the device shown in the figure.
Recommend to read
GEMINI EXCAVATION
These two even look something like a high-performance tool developed by young innovators Dmitrov excavator plant. Brings them closer, and purpose: making large-diameter holes. The...
GLIDER CHAMPION
The triumph of the Soviet athlete V. Extencive in the class of models of gliders ended the world championship in 1973. Short nose and a relatively small shoulder are the main design...