What was found
AFTER TAKEOFF, AILERON WOULD NOT TRAVEL RT VERY FAR. STOP FELT IN YOKE. CONTROL CHECK WAS DONE PRIOR TO FLIGHT, ALL WAS NORMAL. AUTOPILOT WAS TURNED OFF TO ELIMINATE ANY INTERFERENCE WITH FLIGHT CONTROLS. RETURNED TO DEPARTING AIRPORT FOR UNEVENTFUL APPROACH AND LANDING. DISCOVERED LOOSE NUT ON BOLT LOCATED ON PILOT’S CONTROL WHEEL SPACER. THIS ALLOWED BOLT TO MOVE, CAUSING INTERFERENCE WITH CONTROL WHEEL, OBSTRUCTING AILERON COMMANDS FROM THE PILOT. ALL NUTS ON SPACER BOLTS WERE OF THE NON-LOCKING VARIETY. TIGHTENED PILOT’S CONTROL WHEEL SPACER BOLT. INSPECTED CONTROL WHEEL SPACER BOLTS ON PILOT AND CO-PILOT SIDE FOR SECURITY AND PROPER INSTALLATION.