To hold the centerline on the workpiece will help the device shown in the figure.
Recommend to read
NOT A DROP SPILLED!
Pouring viscous fluids are often faced with the fact that the jet begins to envelop the edge of the neck of a can or a jar, especially if it is thick and rounded. So the pot does not...
LAMP… FOR A QUARTER OF AN HOUR
The two elements 373, light bulb 3,5ВХ0,26A, a strip of sheet brass with a thickness of 0.5 mm (150x5 mm), cut cardboard (150X X200 mm), cotton thread, glue, a soldering iron and...