To hold the centerline on the workpiece will help the device shown in the figure.
Recommend to read
“THE ARMORED HEDGEHOG” AND HIS DESCENDANTS
The French fleet of the late 80-ies of the XIX century, is familiar to specialists first of all thanks to Admiral Théophile OBU and his "young school." Well known for their ideas of...
HAND PUMP
Well — vital structure on the estate, even if a centralized water supply system. Design it can be any. We have, for example, the popular tube-wells, good bearing rocks occur close....