To hold the centerline on the workpiece will help the device shown in the figure.
Recommend to read
THE BEST OF THE BEST
Case microsociety class S6A (Fig. 1) champion 1986 A. mityureva formed of two layers of fiberglass with a thickness of 0.025 mm and subsequent treatment with sandpaper. The mandrel of...
ELECTROCITY
Somehow I read in your magazine the article "rainbow on aluminum" and remembered a very convenient way of drawing figures and inscriptions on metal. Brush for these works is a glass tube...