In the "tweaker" folder, locate the file "steerpos.ini" and change the values to 0, like this (example using the CSM 2005 MOD):
[EXTERNAL_STEER_POSITIONS]
CAR01 = @schumacherM
CAR02 = @barrichello
etc.....
; aliases -------------------------------------------------------------------
schumacherM = 0.0000, -0.0620, -0.0020
barrichello = 0.0000, -0.0620, -0.0020
etc....
change it like this:
[EXTERNAL_STEER_POSITIONS]
CAR01 = @schumacherM
CAR02 = @barrichello
etc.....
; aliases -------------------------------------------------------------------
schumacherM = 0.0000, 0.0000, 0.0000
barrichello = 0.0000, 0.0000, 0.0000
etc....
That should move the original stwheel to the center of the car, so it would not be visible anymore