A real newb question stick modding

quick and to the point i have tried taking my ball top off my hrap2sa and i cant unscrew it someone said i need to put a flathead in a slot to secure the shaft to unscrew the ball top. where is this slot do I need to unscrew the back of the stick and open it to get to this slot? please explain modding virgin trying to figure this out.

sry for the total newb question thxs 4 help

Unscrew the 6 bolts holding down the top panel with a #4 size allen wrench. Then look at the bottom of the joystick. You’ll see the slot for the screwdriver. Place it there and unscrew the balltop.