The 'push lever assembly', part #19, actually has a 5/16" ball in there, retained by crimps. Not shown because it's a part of part #19. If the crimps are worn enough, the ball can fall out during side cover removal. Put grease in there to retain the ball during servicing.
The 2nd 5/16" ball, part #16, is still required...
The 2nd 5/16" ball, part #16, is still required...