The Tubing Cutter 1/8 to 1-3/8 Inch is yet another multipurpose tool for cutting copper pipe, PVC, or even stainless steel that isn’t dense. It comes with an extra blade and a reamer.

Straight copper pipe, at least 30cm long. 15 or 22mm diameter central heating pipe works well. (A hardware store may lend you a piece for a minute just to try this out) A circular neodymium magnet ...