This one the enitre face and the motor/sensor mechanism behind is/was already gone.
I can't take pics of it, because I don't have it, and honestly have no idea what it looks like. I'm sure it is a small motor, shaft, pot, and a couple gears all mounted to a plate.
They are all in Japanese, they never released the game in America. Hence my concern that I won't find the parts. I can jerry-rig something for the face mask, but the assembly behind it is vital.