Balls.....

  PJ1 and Bel Ray motorcycle fork oil in SAE 5 weight are excellent choices as they are extremely low viscosity and work well with tight clearances.  I use this in my Platine Verdier turntable and it does not require lengthy warm up times due to the ultra low viscosity.
Ceramic ball bearings are available from McMaster Carr on line for very low cost.   

PJ1 and Bel Ray motorcycle fork oil in SAE 5 weight are excellent choices as they are extremely low viscosity and work well with tight clearances.  PJ1 also offers SAE 2.5 weight which will provide less friction and less stress on the motor.  Some turntables use the friction as an eddy brake for speed control so test them both out to see which works best for your application.  A pint of fork oil is fairly inexpensive ($10.29 at Amazon)..
https://www.amazon.com/s?k=pj1+oil&hvadid=78065392571171&hvbmt=be&hvdev=c&hvqmt=e&am...