Well i was in my mothers house after work, and did some things..
About the ball for Level42:
After i removed it , it looks like there is a crack
the bottom has a metal part with threats, i think is Metric 8 mm.
you cannot read it from my tool, but the shaft is 8 mm.
the ball itself is 36 mm.
a close-up from one of the joysticks..
to take these pics , i removed the monitor..
Label says Sanyo..
on the bottom of the cab i find a loose wire.....
Some pictures of the board set..
After taking a close look, i found one loose connector on the board, "P8" and guess what , the loose wire fits there
now i only need to find out where this wire needs to go
Maybe to here
looks like a kind of "freeplay button" to me , but i dont know
also there is a disconnected potentiometer too there
maybe for the volume or something ?
Some more pictures of the board set..
and the back of the boardset..