I've got an early Gran Sport rear mech with ball bearing jockey wheels, and became concerned about their condition, having never looked at them previously. Pretty straightforward, with two cones and 13 balls. I dismantled all, got the grunge out, then put grease in the pulley body itself to hold the balls in place and added more grease to fully occupy gaps in the pulley body. As rebuilt the bearings are now running in grease, not oil. Is this a proper approach?
St. Louis, MO