To hold the centerline on the workpiece will help the device shown in the figure.
Recommend to read
ON THE WATER FASTER AIRCRAFT
What can you do — we have no way to get the materials, without which, it seems, is impossible to imagine modern models. A thin fiberglass (not to mention the carbon fabric), the specific...
CANDLESTICK-IMPROMPTU
Camping or at the cottage is easy to make in just a minute original and comfortable, and most importantly—reliable in terms of universal fire candlestick. This will require a tin can and...