Note：the drawing does not represent the real object, just show the parameters of the pinion

Object, M0.3 plastic worm, 1 thread,  interference fit 1.0mm shaft, thickness 6.3mm, outside diameter 4.24mm, weight about 0.074g

thickness 6.3mm

outside diameter 4.24mm

Weight 0.074g 

fit 1.0mm shaft of motor

with 12/36T double gear