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
“LILIES” AGAINST “THE LION”
From the point of view of war at sea the eighteenth century has largely been a century frigates. For over a hundred years three major powers of Europe were engaged in a military...
FAST CHURN
The oil from a small amount of cream is easiest to obtain in the following way. You need to take a two-liter plastic bottle, cut the top with a tube (height of cut 60 mm). This cut from...
