To hold the centerline on the workpiece will help the device shown in the figure.
Recommend to read
FROM THE WATER – FIGHT!
Few people of Leningrad, occupancies that August day in 1935, near the Peter and Paul fortress, the Neva river, witnessed the unusual spectacle. On the river, confidently slicing through...
SAILING COAT
We can say that in the mid 30-ies of the aircraft wing went down from the sky... ice. It was then that ka "ice birds" high — speed snowmobiles — instead of sails began to put aerodynamic...