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.
Recommend to read
TEREBILO FOR COBS
"Look through with great interest your section on "Small machines": many useful find here Amateur gardeners. I decided to share a simple tool that has served me faithfully for years is...
THE LITTLE HUMPBACKED HORSE?
"Small, but perfectly formed!" — called our article about microvesicle ("M-K", 1974, No. 5). And the mail brings descriptions of all new designs, such as this one built by father and son...