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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If your glasses plastic frame weakened and became ill hold, press the sticky side of a piece of tape to the end of arch or its supporting platform on the frame, and protruding edges are...