Bending a tube makes it possible to change direction without using a fitting or to perform welding. It saves time and money. Annealed copper is hand-bent, but for hard-work-hardened copper you have to use tools not to pinch or crush it. The result: a reduced interior section and a loss of pressure involving a loss of pressure in your faucets. Use a bender or spring.
With the bender resting on the knee, place the tube in the throat pulley.
Tighten the bending lever to the desired angle (indicated on the pulley).