Jimjimmunster
Bill,
Your 606 was built October of 1977. Last known part number for front bearing assembly was 2-080127-000, but good luck finding that one today! Until 1979, some Royals had both rear and front bearings, but since then Royals only had one bearing, in the rear (which is also why there is only one oil port on the most recent pre-1995 Royal metal uprights).
Thus, I believe the rear bearing assembly (2-080126-000) should be looked into as well. Did you oil that recently?
~Ben
[this post was last edited: 2/22/2017-16:00]