break in using water glass
Yes Yes I even put a drop of oil on the bearing before also.
On motors that have BB i take a eye dropper and put water
on by hand. What happens the water washes away the carbon
witch supports the copper in the brush makes it much faster and
cleaner but you can do without water. In the pro shops they
use a stick abrastive to help especialy big aircraft genators
300a + a pencial eraser will help cleanup the comuator also.CU