Hello Dave, Stringreen, All,
Inquiring minds wish to know.... at least mine does!
What I wonder Dave, is that as you've mentioned, that you've never noted any wear on the original Bearing Ball in your particular instance, and I'm believing one of these answers because of this, was most likely, you were the roiginal owner, and you cared for your turntable.
For those who noted palling (is that the proper word?) on thier original Bearing Ball, I'd wager it was because of one of two reasons, one they bought the table used from somebody who cared diddly about thier table, or they themselves cared diddly.
About the topic of lubricants, which I do feel is quite important, I never noted Harry W ever mentioning greases, until the Inverted Bearing came along.
It was always some other hot ticket, like his own oil, or Mobil 1, then "Sick 50" (I call it), or some other concoctions that others "home brewed"
While I can fathom in a non-inverted design, the oil, by gravity goes to the Bottom of the Bearing well, and there it will protect until it either wears out, or loses it's protective properties, but what I wonder about, is what about the Top of the Bearing Well, where these were either Bushed with Brass, (Or was it Bronze?) and some other synthetic. (Was it truly Rulon, or some other material, such as Delrin, Nylon, or?)
I think one problem of the non-inverted bearing, even though it might have been Rulon Bushed, and supposedly is supposed to be maintainence free as far as lubricants go,, was it possibly a lack of lubricants in this specific area that begins to cause excessive play- slop, and then when a user upgrades to a new bearing, notes good improvement, just because the new bearing has tighter tolerances, less slop?
Although Grease was never previously suggested for the non-inverted Bearings as far as I know, maybe a grease of some type, and of a correct viscosity would have merit, as grease would have a better ability to stay put where one places it?
I've thought along these lines, using a high tech teflon fortified grease, perhaps cut with an oil to make a suitable slurry of sorts which could be maye the best of both worlds so to speak?