Relating to CF, it has been stated "Miyajima has the material used as a nano-tube contained in a thin surround."
This is a interesting option for the Type of CF selected, as the material produced as a Nano-Tube is an Allotrope, offering purity like other Elements used successfully for Cantilevers.
Think of a Wire or a Duct for Fibre Optics. The 20 micron diameter nano-tubes are assembled in a 1-3 micron thick wall housing, producing a Porous Rod / Duct. Diameter variances of the Outside Diameters is proven achievable. 0.2mm OD becomes a Diameter lending itself for mounting a Stylus.
The nano-tube is quite different to typical CF Tows, as it is not a bonded crystalline structure to increase the length, with a structure that is granular. Nano-tubes Carbon Atoms forming the structure.
The nano-tube is very attractive as a material for the structural/rigidity properties, as well as the conduit to transfer energies.
The Graphene Nano-tube could easily be one that makes the Carbon Allotrope Diamond in the Solod Form, work hard for its place, for being Sonically Superior.
Graphene is the Element that started the race for forming a1 micron layer of atoms to be exploited as a material and converted into other forms.
Boron and Beryllium have also now joined the race. Nano-Tubes are a much improved sustainable method for creating a Rod, on this case a Porous Rod.
I can't help myself, I see the future of Vinyl Replay being the domain of the Nano-Tube.
I can see myself, with a Nano-tube Cantilever produced with the Beryllium, Carbon, and Boron Nano-tube as the design - Why Not.
There will be industries seeing the Value in the mixing the materials, so it will at some point down the road become realised. Then it will be a case of a Third Party Cartridge Service being able to purchase a shard of the material with a useful OD.