I've seen this happening with aftermarket blades.... is your's genuine?, happened to me few years ago when i bought a cheap sh*tpart, i ended up replacing only the rubber blade in the original and refitting that... it's still there and working
there is a grommet AMR3932 around the motor's shaft which if is worn the arm can drop a bit under load and that could be a problem


				
				
				
					
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