ignition switch, tumbler, ? searched but this is a little different
 

95 SL500, 67k....searched tech and SL forums but my ignition starting problem seems a little different. Occasionally, cannot start car but key will turn, steering wheel will turn. Put in neutral still won't start. All lights on dash come on, can hear fuel pump, etc. Seems at these times if I wiggle steering wheel or sometimes turn it to full stop left or right then car will start.

Switch or tumbler ?