Product review (5 stars): Kenmore Too!
My 5 year old Kenmore upright failed, and I thought I was in for a replacement.  I figured it was the drive motor, and found the manual.  Imagine my delight when I learned that the motor has a ten year warranty!  Then imagine my dismay when I called Sears Service, and found as others did that it required a service call and a technician to replace it.  I then decided to take it on myself and found a parts list online.  I decided to buy the motor (rotor and stator), and return any parts I didn't need.  I called Sears Parts, and was told that it was a special order item.  Curses!  I then decided to see if I could find it elsewhere and plugged in the part number, and Voila!  I landed here.  It instantly became clear to me that LG made the unit for Sears.  I then took the washer apart and found that the entire problem was that the teeth on the inside of the hub (mentioned in other posts) was shot.  I ordered the rotor and had it within two days.  In the meantime, I took another washer and a star washer, and placed them under the bolt's washer, and was able to snug the assembly up enough to get a few loads of wash done before it loosened up again (the drum rotates both ways, so it tightens/loosens the bolt if there are no teeth to hold it).  Once I had the new rotor, it took all of about ten minutes to put it back together.  I can't say that the replacement is any better than the original - the teeth look like they may be the same material as the original, but that may not be a bad thing, since the rotor is a boatload easier to replace than the drum.  Sure glad I did the research!