Way to get small angular adjustment.
Relative angle between green gear and yellow cam can be adjusted by turning the cam and fixed by pink key.
N1: number of slots on the gear.
N2: number of slots on the cam.
If N1 = N2 = 6, minimum adjusted angle A = 360/N1 = 60 deg.
If N2 = N1 + 1, minimum adjusted angle B = 360/(N1.N2) deg.
In this video: N1 = 6, N2 = 7, B = 360/42 = 8,57 deg.that needs large number of slots to get small adjusted angle.