pardon my domgeid here.
But Flippy, what will the reason for the polish of the spool shaft do?
why are we using bearings?
to prevent the outer casing from damage "bearing fits in snugly into its slot", so basically bearings should not spin.
ok, so inner race of bearing, should fit snugly on spool shaft, again to prevent damage to spool shaft.
ok, so we have bearings, it all depends on quality of bearings.
ceramic bearings tolerance are much smaller.
thus a wobble will not occur to smaller tolerances.
ok, lubrication:
grease, is good, but has more drag.
it will protect much longer but spool speed will be the down fall when using grease.
light oil....rocket fuel...something like that.
viscosity is very low, thus friction is very low, thus spool speed and free spin is increased.
down fall, when the spool starts spinning at that speed, most of the lubricant will move away from the turning, spinning components.
thus prolonged periods of fishing without constant lubrication could cause damage.
adding another bearing will assist in drag, but will assist in preventing/ avoiding wobble of the spool if unbalanced.
this is just my uneducated opinion.
but what works for me, might not be working for you.
also remember the torium spool is heavier then the grandwave spool, just for comparison.
this is why the grand waves are such lekker reels to cast.
.