Here some pictures of the replacing of the old bearings with full ceramic ones with...
...a "dry treatment":
Dry Lightning Lube LBT Dry Lube has been accepted and is widely used in
many industrial applications since the 1960's. Our Ultra Dry Lightning
Lube process is available for all metal parts and eliminates the need
for using any grease or oil. Bearings, gears, chains and more can now be
run completely dry, no more mess! Ultra Dry Lightning Lube can be used
with all greases, fuels and oils to extend the life even further. Most
radial bearing sizes can be processed for $15 each".