Product review (5 stars): Perfect fit.  Fixed the problem right away.
I was hearing this terrible grinding noise from my LG WM0642HW washing machine.  It started intermittently, but over time it got louder and then the  drum stopped spinning.  Did some research, downloaded the service manual, and took the back panel off.  Turns out the bolt got loose over time and the metal teeth of the inner gear striped the plastic teeth of the outer one, which in the middle of the rotor.  Replacing it was very easy.  Loosen the bolt and pull the old rotor assembly straight back. Then push the new rotor assembly in, spin a bit to line up the gears and push it all the way in, tighten the bolt, and put the back cover on.  It was one of the easiest repairs I've done.  Now the washer runs very quietly and the drum spins as it should.