Two of my 42160 wheel hubs developed irregular patterns when spinning, some parts of the rotation felt rough on one, and the other simply had high friction. i chose to try opening one. simply pulling it apart with pliers did not work, so i used a dremel instead and carefully enough cut enough space to use a screwdriver to seperate the two halves of the black part of the hub. the internals seem to come pre lubricated, and i couldnt find any dirt inside that could have been causing the issues. wit