I noticed an oily substance on the table inserts after using my Kapex miter saw. I then saw an oily film between the arbor housing and the blade guard ring. Was grease applied to the blade guard ring by the factory so it would rotate freely or is grease leaking from the arbor housing. I notice the parts diagram shows an o-ring ( part #47)on the arbor housing. I'm not sure if the arbor housing is packed with grease. Thanks for any help on this.