So I just finished up a head job and replaced my timing cover. As I'm going to put the idler pullies on the cover I notice that whenever Tasca Ford or wherever made the cover didn't fully clean off all burrs and defects for the smooth rounded parts for the idler to rotate on. Now my idlers are held up. Whats the best way to smoothen the spots out? They can't even be rotated by hand, at most quarter inch rotations at a time. Tried to post video but video doesn't have correct extension..