What was found
(CAN) AFTER TAKEOFF PILOT REPORTED GEAR UNSAFE LIGHT CAME ON AND STAYED ON AFTER SELECTING GEAR UP. PILOT SELECTED GEAR DOWN AND GOT A 3 GREEN LIGHT INDICATION AND LANDED SAFELY. ACFT WAS SNAGGED AND REPORTED TO MAINTENANCE. UPON INSPECTION IT WAS FOUND THAT THE SHAFT OF THE NLG CENTERING SPRING ASSY, SHIMMY DAMPER HAD SHEARED AT THE THREADS WHERE THE ROD END ATTACHES ALLOWING THE SPRING ASSY TO PIVOT AND GET CAUGHT ON THE WHEEL WELL ON GEAR RETRACTRION. NO OTHER DAMAGE WAS FOUND. PARTS ON ORDER FOR REPAIR.