Torque accessory for force table

For experiments with torque
Acrylic disk, D=160 mm, with centre axis on ball bearings for mounting on the force table, 4 lines of 3 metal screws each at 90° to each other, 25, 50 and 75 mm from the centre point, for fastening the strings (included) running over the pulleys deflecting force over the edge of the force table