hello, my lawnmower with B&S motor had been touched with the knife enemy. damaged knife was removed. with running motor (knife removed) with a screwdriver at the center of the knife grinding shows side impact, estimated 1-2mm. height impact – no one can be detected at the meter image as well as at the top. game has the crankshaft none. question: to what extent is a side impact of 1-2mm normal ? me would especially experience values inte thank you in advance !