Note：the drawing does not represent the real object, just show the parameters of the pinion
Module 0.3 9/10/11/12 Teeth Nylon Pinion, Interference Fit 1.0/1.2mm Shaft of Motor,The manufacturers to sale coreless motor with brass gears is a conspiracy, the installation of brass gears is easy to damage the motor, personal no special tools are difficult to install, it is easy to break the motor, so you can only buy the manufacturer's original motor with brass gears.
Real thing, 11 teeth/1.2mm changed
Suitable for 1.0mm shaft of motor
Suitable for 1.0/1.2mm shaft of motor