Work with roller glass cutter will be much more accurate if the basis for such processing, as shown in the figure.
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A COMPASS CUTTER
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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If you want to cut the glass not by the usual straight lines and sinuous, shaped (e.g., stained glass) — the plot thickens. However, it will be easier to perform if under the glass to...