I should like to see a sketch of what you mean by the lower spacer ring (64) having a "shoulder"Felt, or not?
I have been scratching my head for a while on the the lubrication of this, now I have figured that out I'm putting it back together.
Have another small doubt, there is should be a felt ring, 5mm thick 15mm high, just above the top of the taper bearing.
View attachment 407245
Red / crosshatch in the drawing
View attachment 407247
Incidentally, the assembly on my unit is different from the drawing and description as there is no adjusting spacer 67. Instead, washer 64 has a shoulder of corresponding height. I think this makes sense, because even with a the precise spacer, pre-loading of the lower thrust bearing id done with the external threaded nut 65, so why bother with an extra part.
In the drawing the spacer #67 sets the axial position of the entire spindle, so its thickness controls the position and hence the clearance of the main spindle/ bushing.
Also,be careful here, plate ball thrust bearings are NEVER preloaded, unlike a radial ball bearing or tapered roller bearing there is nowhere for
compression forces (preload) to go!
They should always be setup with some end clearance. suspect on that setup one would need to have .0002-.0003" of end float.
Remember that the thrust bearings are directional....there will be a race that has the inner ID smaller to be a fit on the spindle while the opposite race will have clearance to allow the spindle to rotate.
Have seen more than one assembly done incorrectly which prevents the thrust bearings from functioning correctly.
Looks to me that the felt is there to keep oil from running through the spindle so that some will remain at the ball bearings and some available to
feed the upper end of the bushing, ( its sits vertical and the upper part of the bushing will not see much oil from the middle felt.