A new cartridge replacement on my Well Tempered turntable seemed to shed a brighter light on a channel imbalance. On closer inspection the tonearm silicon had become too thick and the Acrylic platter was no longer level with the plinth nor was it perpendicular to the tonearm pillar. Adjusting the platter spindle seemed easily adjustable using the nylon grub screws within the spindles high tolerance well anodized two piece aluminum bearing assembly.
To adjust the nylon grub screws within the bearings inner cup it must first be extracted from the outer cup. After removing the platter and spindle one might be able to simply stick a finger in the bearing assembly and lift out the inner bearing. With a combination of shear suction and years of time mine wouldn't budge.
With the platter and spindle already removed I disconnected and removed the cartridge the tonearm and drained the old tonearm silicon. I stuffed paper towels in the bearing to soak up the bulk of its silicon.
I was unable to push the bearing assembly out from the underside of the plinth by hand. I cut a piece of inner tube rubber and two sided taped it to the bottom of the bearing. Using the bottom of an 1-1/4" socket with a short extension in the hex side of the socket to carefully drift the assembly out from the plinth.
Wash out the bearing with mild soap and warm water.
Fill a deep saucepan with enough water to reach the underside of the bearings flange.
Dry the bearing and placed it in the freezer for at least two hours or more.
Bring the water to full boil and remove the saucepan from the burner.
Using a tongs place the frozen bearing in the hot water for 10-30 seconds then remove the bearing into a dish towel and stick your finger in the still cold inner bearing, twist and pull on the inner cup.
Continue to repeat the freezing and heat until the upper two nylon grub screws are accessible (about 3/4") using a 3/16" or 5mm allen wrench.
Care must be taken not to strip the nylon sockets as the nylon grub screws may be just as stuck as the bearing.
I applied a plastic compatible gear oil on the threads of the grub screws and placed the bearing grub screws down, back in the freezer so the oil doesn't flow off the threads.
Remove and carefully work the screws loose with short back and forth movement. Repeat the freezing as needed.
The inner portion of the bearing assemble extracted about 3/4" to access the upper grub screws.