Paul I will say I handpicked bearings in the 70's that crappy car builders (the big three) used to build. I found out it was way faster to have the five gallon jug with a funnel shaped steel piece that I would put the bearings on and then lock it into place and give the handle a couple of pumps and the bearing was packed full of fresh grease.:-) Of course that was after cleaning out the old grease and inspecting the bearings. Oh yeah that is how i made money, called a job.
. I think they could come up with a sealed bearing that would do better than what we have now.
Tom Marty