A C210 LANDS WITH DAMAGED NOSEWHEEL RESULTING IN A GND LOOP ON THE RWY. DAMAGE ALLEGED TO HAVE BEEN CAUSED BY TOWING OF ACFT PRIOR TO DEP.

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PLANE LEFT PARKED ON RAMP IN FRONT OF FBO. PARKING BRAKE SET. DOORS AND WINDOWS OPEN. BORROWED AUTO FROM FBO TO TAKE PAX TO COMMERCIAL TERMINAL. INFORMED FBO I WOULD BE GONE ABOUT 30 MINS. ASKED IF PLANE POSITIONED OK TO LEAVE; SINCE FBO HAS HUGE RAMP/PARKING AREA. TOLD ACFT WAS FINE. ONLY 2 OTHER PLANES IN AREA IN FRONT OF FBO. RETURNED 25 MINS LATER. PLANE HAD BEEN TOWED TO EDGE OF RAMP AREA (ONLY 3 ACFT ON HUGE PARKING SPACE). SEVERE WOBBLE ON TKOF. CALLED TO TWR TO NOTIFY OF PROB. GEAR WOULD NOT RETRACT. OFFERED EXPEDITED HANDLING FOR IMMEDIATE LNDG. DECLINED. FLEW TO HOME BASE WITH GEAR DOWN. MADE PRECAUTIONARY PASS AND TOLD GEAR APPEARED TO BE DOWN; BUT FRONT GEAR CANTED TO L. EMER GEAR ROLLED OUT; STALL TOUCHDOWN IN NOSE HIGH ATTITUDE TILL COULD NOT KEEP NOSEWHEEL OFF GND. (GND DOWN TAIL TIE-DOWN LOOP AND REPLACEMENT COST HAS NOT BEEN FIGURED INTO THIS BILL.) PLANE BEGAN GND LOOP TO L. HARD R BRAKING STOPPED ACFT AT 180 DEG TURN. MECH INSPECTED AND REPAIRED (PARTS SENT TO YOU). ORIGINALLY MR X SAID HIS INSURANCE WOULD HANDLE; THEN DENIED ANY RESPONSIBILITY. SEE ENCLOSED LETTER RETRACTION ARM SNAPPED CLEANLY INTO TWO. NO WEAR NOTED. REMEDIAL ACTION: VERY CLOSED INSPECTION OF ALL VIABLE PARTS OF ACFT AFTER ANYONE TOUCHES/HANDLES IT. DO NOT 'JUST RUN THE CHKLIST.'