The tightness of the pressure plate and the shell no more than 0.2mm.
The worm gear, the worm and the adjusting shaft are fully coated with grease
At the shaft pin hole of the handle of the adjusting arm housing. Add 4500N.M from P or K direction, there should be no abnormal phenomenon.
There should be no cracks, bumps and other undesirable phenomena on the surface of the shell, turbine and worm.