Cause: A. The lower pressure plate is too dirty or has foreign matter; B. The end face of the saw blade bushing is too dirty; C. The saw blade is not well balanced.
Correction: Remove foreign matter from the lower pressure plate and bushing, swap the upper and lower pressure plates, and use a well-balanced saw blade. Loosen the pressure plate screw (appropriate), turn the saw blade to a certain angle by hand, and tighten the pressure plate screw (can be repeated multiple times) to get the best result.