To hold the centerline on the workpiece will help the device shown in the figure.
Recommend to read
RUN — THROW
Throwing gliders enjoy enduring popularity among modelers — both beginners and experienced. The fact that these miniature models have performance more solid aircraft — they are capable...
RESCUE TRIAC
Utterly exhausted by his refrigerator, which has neither a hot day, then another "surprise" in the starting relay, was forced to ask for help in workshop. There categorically stated:...