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
DECORATE WITHOUT PAINT
Any owner can independently, without men's assistance, become familiar to update kitchen cabinets, bringing in solid color his panels any decorative ornament. And not resorting to dyes,...
AMPHIBIAN ON BED
We present a prototype of the amphibious machine is a device hovercraft (Ohr) under the name "Aerodzhip", publication of which was in the journal "modelist-Konstruktor" No. 7 for 2007....
