Just a brief bit of news from your local rapier marshal:
In response to recent concerns about rubber tips failing surprisingly quickly/suddenly, the Society Rapier Marshal decided today that all tips (rapier and dagger) shall have a flat metal piece between the tip and the rubber blunt (previously, daggers required no "spacer", and rapiers could use either metal or leather).
The exceptions to this are: if your sword has a metal stopper welded or otherwise attached to the end, then that counts and you don't need anything else between it and the rubber blunt. If you're using an experimental Darkwood tip, you don't need to add anything to that, either.
If you have any questions, please feel free to ask me, or any other local rapier marshal (Anton, Kai, Tedesco, Logos, Terry, Adrian, Alexander, Emm, Cecil, Andrew, etc, etc, etc...)