Linking a post that should be here.
Zento Signature disassembly
metal_punching_grip managed to disassemble it:
The nose cone attaches to the metal core and holds the grip and the silver ring in place.
Tightening the cone while holding the rear thread solved my wobble problem.
Regarding the materials used:
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the core is chromed metal (non-magnetic, probably brass, maybe one day I’ll scratch the coating to be sure)
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the ring is probably steel (it’s the part that attracts the magnet in the cap)
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the grip is some hard plastic/composite, probably the same as the rear body
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the nose cone is painted brass (the golden colour is visible in the unpainted inside)