You can try ask any TD, maybe someone will able source the top ceramic part for you. I believe it's not necessary has to be from v6f. If you are lucky then just replace it by your own - believe me it's easy.
Hi
I would for cheap as it needs a new stem...It broke today!! It runs and all and has one of the last engraved rotor! Are you still interested. I don t have the time to source and repair rignt now.
II ll put up some pics and you can decide.