Product review (4 stars): You can do it - Unleash your inner Appliance Repairman!
My wife was distraught when our 9 year old LG front loading washer started making grinding noises and the tub would no longer spin.  After checking some online appliance repair sites, I narrowed it down to a very likely cause - splines on the original rotor assembly had sheared off by the metal teeth of the tub shaft.  I believe the original rotor may have had a plastic splines, which is a straight-up design flaw, but this unit has metal splines, so I don't expect to replace this unit again.  Dump the words "replace rotor assembly LG washer" into your favorite search engine and you'll find the video that explains the fix. You will only need to remove four screws to remove the access cover in the rear, and then a a socket wrench to knock loose the bolt that holds this in place.  You can find this slightly cheaper online elsewhere, but when the laundry is piling up and Mamma's not happy, Amazon Prime to the rescue!