Even when the blade cut along a wooden ruler — there is no guarantee that the edge, huddling, does not crash or find yourself on it.
This will not happen if the shaver to wear a paperclip as shown: she cut off the blade from the line and the cut goes right.
Recommend to read
INSTEAD OF A JACK — A SCREW
"Juice with a jack" — that's what the article was called, published in "Modelist-Konstruktor" No. 4 for 1998. I liked the simplicity and unconventionality of the technical solution...
BATTLESHIPS OF ASSYRIA
It is no accident XII-IX century BC historians call the "dark ages". During this period, the tribes inhabiting the Northern and Eastern coast of the Mediterranean sea, meeting...