Carefully cut a circle from the cardboard using scissors is very difficult. To help in this work can usually tsyrkul fixed in his foot, as shown in the figure, a razor blade.
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It all started long ago, with one of the publications in the journal "modelist-Konstruktor" No. 5 of 1981, a binder which we keep, and from time to time viewed. In the article it was...
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Somehow I had the need to cut a thin sheet of plastic. Due to its large size, use the hacksaw was impossible, but to cut just the canvas for a long time, and breaks it in his hands....
