Working with a file always takes a lot of time, particularly where its course is restricted: in a deep hole, in a curved channel. Here come to the aid of a power drill. Hold its cartridge needle file with round cross-section or chip of a round file with machined shank: spiral cut works great not only during forward movement but also during the rotation. I. POPOV, p. Konosha, Arkhangelsk region.
Recommend to read
AND EVEN CRAYON
As you know, along with the obvious positive properties of the collet legs of a compass also has its drawbacks: requires the stylus is of a diameter; and if it is broken — remove it not...
THE EVOLUTION OF THE BIAXIAL
From the history of the tram car. The fact that on the tram lines of the country "standard" rolling stock occupied by the end of 1930-ies a dominant position, does not mean that he was...
