It has been said to use all Seimitsu parts, but no one seemed to know what exactly these parts were, so I decided to open up my 9000TB and take a peek.
First, after taking off the casing, this is what the inside looks like:
A close up on the joystick reveals it is indeed a Seimitsu LS-32:
Here is a pic of the button PCB. All the buttons are (unfortunately) soldered on the PCB, making modding a bit trickier than with quick disconnects like those found in the PS2 Hori RAP:
A picture of the buttons from the side. All 8 buttons are Seimitsu PS-14-G:
Here is a pic of the shaft without the balltop:
It is higher than a normal LS-32, as there is no mounting plate below it. Perhaps a mounting plate could be added to lower the height of the shaft? Seems like an easy mod.
Finally, here is a close-up on the joystick with the balltop back on:
So there you go. This stick does indeed have all Seimitsu parts (as Gaijin Punch and others said), and these parts specifically are the Seimitsu LS-32 joystick with Seimitsu PS-14-G buttons. The lack of a mounting plate on the LS-32 explains its higher-than-normal shaft height.
For those looking for a Japanese Arcade-quality alternative to a Hori RAP for their supergun and/or PS2 shmupping needs, this is a great option.
