Grind Machine hubstacks problem

Ive had my GM for i bit now and all of a sudden the hubs dont spin for as long as they did when i broke them in.Ive thin lubed the bearings on the hubs i dont know if thats the problem if it is could someone plz post a hubstack cleaning video

Clean them like any other bearing.

so jus remove sheilds and chuck it in a jug of paint thinners. and after thin lube or leave dry??

Yea basically

yer but should i leave them dry