To hold the centerline on the workpiece will help the device shown in the figure.
Recommend to read
THE LAST EFFORT OF THE EMPIRE
The accession of Britain, largely against the will and in a rather unprepared state, in the war with Germany questioned the most promising projects in the field of shipbuilding, related...
PIPE THE PIPE THROUGH THE PIPE
For bending metal rods and pipes there are many ways and devices. Most often this operation is performed on the bending. But not everyone (even of the workman person) he has. The easiest...