Place each blade with the inside of the pipe facing down. Mark and cut these lines, using the jigsaw.Make a mark at the other end of each strip 30 mm from the left edge.Make a mark at one end of each strip 115 mm from the left edge.Take each strip and place them with the inside of the pipe facing down.Cut along these lines, using the jigsaw, so that you have 4 strips of 145 mm and one strip about 115 mm.Going right around Line C, make a mark at every 145 mm. Going left around Line B, make a mark at every 145 mm. Mark a line along the edge of the paper at each end. Make sure the short side of the paper is straight along Line A and the paper is straight against itself where it overlaps. Wrap this around the section of pipe at each of the two the marks you just made, one then the other. Tape 3 sheets of A4 paper together, so that they form a long, completely straight piece of paper.Make a mark near each end of Line A, 23″ apart.Push the pipe tight against the tubing and mark the line where they touch. Place the 24″ Length of PVC pipe and square tubing (or other straight edge) side by side on a flat surface.Makes 9 blades (or 3 blade sets) and a thin waste strip.
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