Ask your mate if he thinks any of these components would be handy to have working ok for his 100nm flight.
2200 hr overhaul BASIC R44 parts list:
C006 MR Gearbox
A120 Bell crank
C169 Muffler
C012 MR Flight Controls
A190 Drive V-Belts
C170 Sheave
C013 TR Flight Controls
C008 TR Assembly
C258 Pitch Links
C017 Swashplate
C016 MR Blades
C274 Windshields
C018 Clutch
C020 Upper Frame
C667 Skid Shoes
C021 TR Gearbox
C027 Cooling Panels
C947 & A947 Flex Plates
C051 Actuator
C121 P/P Tube
D079 TR Guard
D174 Fanwheel Engine
C005 MR Hub
D224 TR Driveshaft
C158 MR Spindles
C031 TR Pitch Control
C159 Pitch Bearings
C007-5 Fan Shaft & Bearing