This combination is consistent with the essence of modernization, which want to offer such a famous fixture as a screw. It is clear to everyone that it holds better than a nail, but it requires more effort and time for screwing. If it is to drive with a hammer, the material is crushed, it does not form a threaded groove. My screw (1) with longitudinal grooves on the threaded part, produced by forcing through a die (2). It is possible to drive a nail. You only need a little then turn the bolt with a screwdriver: the remaining part of the coils will cut into the material and will hold securely.
C. CUTTINGS, Leningrad
Recommend to read
TRAILER-UNIVERSAL
In recent years, more and more difficult to find untrodden place, even in the Northern Russian province, for collecting berries, mushrooms and, of course, hunting. The most attractive...
DINING FOLDING
In a small room dining table standard sizes — already a hindrance. Much easier if in the off position, its surface could reduce to, say, fold to the size of the narrow tables occupying...
