I finally got to replacing every bearing with NSK bearings which Rotrex also uses from the factory. Luckly, all but one of the bearings I purchased locally were made in Japan. Not sure if that makes any difference (likely not) but it's JDM yo.
Rotrex made all of the bearing bores a little big to make assembly easy I assume. Unfortunately, the bearings are not seated properly and slowly enlarging the bore as time goes on. I noticed that there was some signs of wear in very bearing bore but less severe compared to bearing #2 in the previous photos.
I decided to use some Loctite 660 retention compound on all of the bearing outer races to prevent them from spinning.
Hopefully this will be the last time I see the inside of this thing.
Mated the two parts back together using Ultra Black RTV and red Loctite where needed. It feels good to have it back together
