What was found
AFTER TAKEOFF LANDING GEAR HANDLE WOULD NOT MOVE TO ALLOW RETRACTION OF GEAR, ABOUT 40 SECONDS LATER A SMALL THUMP OCCURRED AND WE WERE ABLE TO RETRACT. JACKED AIRCRAFT, FOUND NOSE STRUT TO EXTEND TO FULL LENGTH. PERFORMED GEAR SWINGS. NO DISCREPANCY NOTED. RESERVICED NOSE STRUT WITH NITROGEN AND FLUID, IAW MM CH 12-10-38. FINAL GEAR SWING OPERATIONAL CHECK GOOD.