PLT LOST DIRECTIONAL CTL OF HIS SMA SEL DURING TKOF DUE TO HIS SEAT SLIDING BACK AND REMOVING HIM FROM THE ACFT RUDDERS AND BRAKES. HOWEVER; HE WAS ABLE TO CTL ACFT SUFFICIENTLY TO AVOID HITTING A RWY LIGHT AND A WIND SOCK POLE.

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PRIOR TO TAKING RWY 31 AT MLI FOR TKOF; ADJUSTED PLT SEAT CLOSER TO INST PANEL 1 STOP. TRIED TO SCOOT SEAT BOTH WAYS AS A CHK THAT THE LOCKING PIN WAS SEATED AND SEAT WAS APPARENTLY LOCKED IN PLACE AS THERE WAS NO SIGNIFICANT MOTION. HOWEVER; UPON ADVANCING THE THROTTLE FOR TKOF; THE SEAT SLID BACK TOO FAR FOR THE PLT TO REACH THE RUDDER PEDALS. THE THROTTLE WAS PARTLY WITHDRAWN (OR MAYBE FULLY) IN AN ATTEMPT TO ABORT THE TKOF; BUT THE AIRPLANE WAS HEADING TOO FAST OFF THE L SIDE OF THE RWY AT A RWY LIGHT AND NO BRAKING WAS WITHIN REACH. THE AIRPLANE WAS LIFTED OFF IN GND EFFECT TO AVOID THE RWY LIGHT; SUCCESSFULLY; AND POSSIBLY SOME THROTTLE WAS ADDED; BUT PROBABLY NOT MUCH; BECAUSE OF THE LACK OF RUDDER CTL. NEXT THE AIRPLANE WHICH WAS IN A POSITIVE RATE OF CLB BY THIS TIME; HAD TO BE BANKED TO THE R TO AVOID A POLE WITH A WINDSOCK ON IT. ONCE THE MANEUVER WAS COMPLETED; WITH NO OTHER OBSTACLES IN SIGHT; THE PLT WAS ABLE TO RETURN HIS SEAT TO THE PROPER POS AND REGAIN FULL CTL AND CONTINUE THE CLB. HE RPTED WHAT HAD HAPPENED TO THE TWR AND TOLD THEM HE WANTED TO CONTINUE THE FLT TO MGY. HOWEVER; WHEN THEY ASKED HIM TO CALL THE TWR WHEN HE REACHED HIS DEST; HE OFFERED TO RETURN IMMEDIATELY. HE ALSO ASSURED THEM THAT HE HAD FELT NO JAR AS IF THE AIRPLANE HAD CONTACTED ANYTHING AND THAT IT WAS RUNNING FINE. AT MGY; HE CALLED THE MLI TWR AT THE NUMBER THEY HAD GIVEN HIM. HE AGAIN ASSURED THEM THAT THERE WAS NO DAMAGE TO HIS AIRPLANE. UPON HIS INQUIRY; THEY SAID THEY HAD FOUND NO DAMAGE AT MLI. UPON THEIR REQUEST; HE GAVE THEM HIS NAME; ADDRESS; AND TELEPHONE NUMBER. A CESSNA SECONDARY SEAT STOP KIT IS INSTALLED IN THE AIRPLANE; WHICH SHOULD HAVE PREVENTED THE SEAT FROM COMING SO FAR BACK IN EVENT OF LACK OF LOCKING IN PLACE. THE PLT PLANS TO TAKE THE AIRPLANE TO THE CERTIFIED REPAIR STATION WHEN HE HAS THE ANNUALS DONE ON THE AIRPLANE; TO HAVE THE SEAT RAILS AND LOCKING MECHANISM CHKED AND ALSO THE ACTION OF THE SECONDARY SEAT STOP. ON THE GND; THE STOP APPEARED TO WORK OK WHEN TESTED BY THE PLT AT MGY. IN THE AIR AT MLI; THE NORMAL LOCKING MECHANISM APPEARED TO FUNCTION PROPERLY; AS IT DID LATER AT MGY.