SAB Heli Division Goblin 700 Manual page 13

NOTE 1
When you tighten the collar (H0020-S) on the main
shaft, ensure there is no axial play.
NOTE 2
The pinion and gear are designed to have zero
backlash. This leads to initial "rough" rotation.
After some run in flights (3-5 flights) it will begin to
rotate freely, ensuring perfect contact and the ability
to transmit maximum power.
It is advisable to lubricate these two elements with a
lubricant like WD40.
Main Shaft
)
( H0021-S