NEED HELP IN REMOVING CONSOLE PLATE

I NEED TO INSTALL A SERVICE METER ON MY SZ2042 ZERO TURN. THE HOLE IS NOT THERE ON MY MODEL SO I WILL NEED TO CUT THE HOLE. I THOUGHT IT WOULD BE EASIER TO REMOVE THE THROTTLE AND CHOKE CONTROLS, BLADE SWITCH AND IGNITION SWITCH THIS WOULD ALLOW ME TO REMOVE THE PLATE FOR EASIER DRILL AND SAWING. PROBLEM I'M HAVING IS HOW DO I REMOVE THE KNOBS ON THE THROTTLE AND CHOKE CONTROLS? ANY HELP WOULD BE APPRECIATED.