created the torsion vibration plate deformation, cause weld depressions bigger;
In the traditional (5) cleaning oscillator, vibration plate plate there is no external force factors; 6 oscillator bonding, twist, twist is using a wrench to gelatinize after screwing in installation of the stud vibrator twist in the vibration plate plate surface, in the process of twist, twist how much force will cause slight damage to usm, will also pits on the surface of the vibration plate to further increase, wi