MBC pivot bearing with transmission ratio

For setting up a hand- or motor-driven oscillating machine, for experiments on circular motion, centrifugal force (spherical levitation, earth flattening rings), centrifugal force regulator, rotating liquid (centrifugal flask) and rotating pendulum (Foucault pendulum);
Robust DC motor as a very low-friction rotary bearing, axle with two shaft wheels of different diameters for fast and slow rotation speeds, M3 thread for holding various attachments, mounted in ABS plastic housing, with two 4 mm sockets for power supply, housing base with 4 magnets inside
Diameter of the shaft wheels: 8 mm and 24 mm
Dimensions (housing): 84 x 84 x 39 mm
Dimensions (total): 84 x 84 x 51 mm
Mass: approx. 139 g