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
ONE INSTEAD OF FIVE
Combination wrench for cylinders. Probably no industrial sector or agricultural workshop now can not do without gas welding or cutting metal. Widely used and effective method such as...
NOT A BRUSH, AND ROLLER
Not so easy to hold on the wall paint a straight line but still the same width — any brush here — unreliable assistant. Easily cope with this task will fail if the manufacture is shown...