Serviceability didn't seem to be a concern of the designer, though to their credit it does have a full complement of 11 balls per cup, while remaining simple to install at the factory.

With my Nishiki Seral's Hatta cartridge bottom bracket, the same problem, i.e. serviceability is very poor, because one can only secure the cups with a pin tool! There are no flats, spines or hooks for a proper spanner of any kind.

I know that even using two pin tools to engage four of the holes in each cup, I still wasn't able to secure the cups with a proper amount of torque, only a fancy 6-pin factory tool would accomplish that in all likelihood.

But, new Japanese bikes were somewhat notorious for having the fixed cup become loose within the first few hundred miles, so I guess only very light pedaling was expected(?). Grrrr.