Fluid flow control devices, rotors and magnets with increased resistance to inadvertent setting change and improved accessory tool coupling

A cartridge assembly for an adjustable fluid flow control device comprising:

• a rotor assembly comprising a base with a central aperture, a magnet mounted in the base, a first protrusion comprising a stem and a second protrusion comprising a tab extending from a lower surface of the base;
• a cartridge housing comprising a central rotor pivot configured to engage the central aperture,
• a dual concentric stair-step array,
• a plurality of stops wherein two stops of the plurality are configured to receive the stem therebetween to limit rotation of the rotor assembly about the central rotor pivot.