More of a PSA than anything: I have a Liftmaster center jack that I've enjoyed using for the last year. It's pretty to quick to go up or down and holds the bike well when I need to do a tire change or other maintenance on the lift. About 6 weeks ago I found a ball bearing on the floor (always fun), but found that it matched the size that was in my rolling shop chair (which has had a hard life). Last week when I was working on a friends bike, I had a heck of a time trying to use the center jack and finally noticed that 80% of the bearings were gone, I broke one end of the bearing retainer, and the bearing cage was crushed. Dumb me didn't think to take a moment and see if the bearings were actually greased from the factory. A new, higher quality 51102 thrust bearing was secured from a bearing supplier for ~$15, greased, and installed. The jack works great now. I suspect that most of these lifts are made in the same factory, so hopefully this will save someone from having to go through an ordeal.