If there is any doubt about the lamiflex bearings and they are the source of the problem you will not be able to track the blades successfully. This has caused untold amounts of grief in the past. You might also want the engineer to remove the lamiflex bearings and see if there is any surface corrosion between the nut and the bearing. This has been know to happen in the past and cause the bearing to stick. Just remove the corrosion and refit and retest. Only do this if the corrosion is minor and has been assessed by a qualified engineer.
Good luck!