All the replaceable parts needed to rebuild the NuVinci N171 hub:
3 stainless torx head M4 screws to replace the socket head screws that are too easy to strip.
3 toothed lock tabs.
1 main O ring.
1 fluid drain/fill plug with debris collecting magnet.
1 rare 1.125″ groove x .025″ snap ring.
1 freewheel/track cog carrier.