When sawing any, but in particular plastic pipes (due to its “softness”) to withstand the cutting line is exactly perpendicular to the axis (or if necessary – on the contrary, under the right angle) will help the duct tape. Wound appropriately a ring from it will not allow the cutter to get off.
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GUIDE FOR THE GLASS CUTTER
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...
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For more convenient use of masking tape or duct tape, there are special tapes with a knife, not giving to the same after use to stick the remaining end. In the absence of such a device...