BE1900 CAPT ABORTS TKOF WHEN A COMPONENT OF THE CTL LOCK SYS LODGED ITSELF IN THE RUDDER LOCK.

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DURING PREFLT; THE CTL LOCKS (YOKE PIN; PWR LEVERS; AND RUDDER PIN) WERE REMOVED. A CHK OF ALL FLT CTLS WAS CONDUCTED AS PART OF THE AFTER ENG START CHKLIST; IN WHICH NO ABNORMALITIES WERE OBSERVED. THE ACFT WAS TAXIED FROM THE CONCOURSE AT DEN TO RWY 34L; WITH NO STEERING ABNORMALITIES OBSERVED. STEERING IS ACCOMPLISHED THROUGH CTL INPUTS BY THE CAPT TO THE RUDDER PEDALS; WHICH ARE CONNECTED TO THE NOSEWHEEL. WE WERE CLRED FOR TKOF ON RWY 34L. AT 80 KIAS; THE RUDDER PEDALS SUDDENLY BECAME COMPLETELY STIFF IN THE NEUTRAL CTL POS. NO AMOUNT OF FORCE COULD MOVE THE PEDALS. I ABORTED THE TKOF; AND AFTER THE ACFT HAD SLOWED SUFFICIENTLY; I DISCOVERED THAT A COMPONENT OF THE CTL LOCK SYS HAD LODGED ITSELF INTO THE RUDDER LOCK. I REMOVED THE ENTIRE CTL LOCK ASSEMBLY FROM THE FLOOR OF THE COCKPIT; AND SECURED IT BEHIND MY SEAT. ANOTHER CHK OF THE FLT CTLS WAS CONDUCTED WITH NO ABNORMALITIES; AND NOSEWHEEL STEERING WHILE TAXIING RETURNED TO NORMAL. WE AGAIN DEPARTED RWY 34L; AND COMPLETED 4 LEGS IN THE ACFT UNEVENTFULLY. THE YOKE PIN; PWR LEVER LOCK; AND RUDDER PIN ARE ALL CONNECTED WITH A CHAIN. NORMAL PROCS AT OUR AIRLINE ARE TO REMOVE THESE DURING THE PREFLT; AND PLACE THEM ON THE FLOOR OF THE COCKPIT UNDER THE CAPT'S SEAT. NOTHING SECURES THIS ASSEMBLY WHILE IT SITS ON THE FLOOR; AND IT CAN BE MOVED WITH A FOOT OR BY TURB. I DO NOT KNOW WHICH COMPONENT (CHAIN; PIN; ETC) HAD BECOME LODGED IN THE PIN-HOLE FOR THE RUDDER LOCK. THE RUDDER IS NORMALLY SECURED DURING PARKING WITH A PIN PLACED INTO A HOLE IN THE FLOOR OF THE COCKPIT UNDER THE CAPT'S SEAT.