2020 update : JC Verdier La Platine

Regarding the use of the ball, I understand the explanation by @thekong. However, I am still not quite convinced. It is true that magnetic force would experience fluctuations, hence a rotating platter using magnetic repulsion would experience some degree of wobble. An air bearing would also experience the same due to the fluctuation created by the pump. But inserting a ball in contact with the platter introduces a pin connection. Depending on the surface of the ball bearing, which  will also have some degree on imperfection, it will create its own fluctuation, another form of chatter. It is this part that  I do not quite understand. 

Using the ball bearing as an energy sink, draining away excess energy caused by the interaction of stylus / vinyl groove and the continuous changing wavelengths, is a very well known argument. However, given its 16 kg weight and the inertia, how much energy will be transmitted from stylus to bearing? And given that the Continuum platter is even heavier at 84 lb =38.102 kg, and the energy sink idea still holds for that TT, I must be missing something!!!

My apologies for being thick as a log on this one. I have the sense that some basic physical principles seem to have been side stepped in favor of hifi jargon? 

i did adjust my la platine and added the ball bearing back into it.  i don't have fine adjustment i just have the bolt and nut at bottom.  after i did this i listened to all 6 sides of Kanye's "My Beautiful Twisted Dark Fantasy".  This kind of record is surely the orchestral work of our generation.  So much scale and complexity.  So much drama.  It was one of those moments that leaves one gobsmacked.  I didn't think about the system very much.  I just revelled in what it let me hear from an artist  who is surely a genius.  Profound change! The La Platine is an obsession because it is so rewarding.  But like @ledoux1238 i don't understand why the ball bearing is a positive but i think it is.  For one thing it makes piano sound "right" in a way it seldom does sans ball.

PLATINE UPDATE

I got the pip night before last and decided to decommission the Platine and reinstall the garrard 401.  i was just hating the sound.  this lasted one evening (garrard is a tad thick versus platine and i don't want that). 

i then spent alot of time sulking and reading about micro seiki's and techdas af3p's and galibier "savoies" and stelvio mark 2s.

i was convinced the platine was doomed even if i upgraded the motor.  i felt trapped.

i then last night at midnight put the platine back together and used my old motor.  the original verdier DC motor which i described as "broken" for all intents and purposes not 2 weeks or so ago.

oh glory!  oh beauty!  i had not seen your face for days nor felt your heart, but here you are, returned!

the music hangs in space.  it is enchanting.  almost timeless.  i can now hear that the ac motor (shabbily mounted of course) was fuzzy (i actually started to think this was the platter - i was wrong).  the verdier motor lets me hear all the way into the music but not in a left brain dissect a frog kind of way.  i think to some degree i am reaping the benefits of my new isolation platform more fulsomely with the quieter verdier motor.  also the Baerwald alignment which is a real hit with me.

a very excited and happy platine owner once more!

@mr_gray The original motor is temperamental. With silk thread I make adjustments every other listening session. In the summer, my room would be in the low 30’s in Celsius and 90% humidity before I turn on the AC. However, with the Jasmine DC motor, it has been quite consistent for the past few months. 
 I wonder might there be other factors that is affecting what you heat with the difference motors? 
 

Christan from SOTA responded to my initial email regarding the Eclipse motor. He can machine a pulley, a flat cylinder, that will work with tape drive, if I supplied a drawing. He would fit the motor into a pod, if I supply the pod. Magnet update to follow. 

i think the SOTA motor is a great idea.  that sounds very encouraging @ledoux1238 .  i saw sone stats re: American Sounds AS2000 speed stability the other day.  it of course uses the roadrunner speed controller the SOTA uses (maybe pretty much same motor - i am not sure).  the numbers were amazing.  33.332 to 33.334 i think.  out of this world.  i have speed variation of 0.15-0.2 rpm and think i am in heaven!