Thanks for all your advice thus far, sadly the Stanley blade, screwdriver blade method is not working as the riv nut is quite loose so it's not looking possible to wedge something in to stop everything spinning. Add to that that the riv nut is so brittle it is also starting to crumble, I'm now stuck a bit and hoping you all have some other methods that can be tried.
Has anyone had any experience in sending their frame off to get this issue resolved, as at least then I have that as as last resort if nothing else works.
The riv nut is Alu, so would some sort of treatment melt it away but leave the ti? I know it isn't pure ti, but some form of ti alloy, so maybe not such a good idea, just trying to think of other possibilities.
Has anyone had any experience in sending their frame off to get this issue resolved, as at least then I have that as as last resort if nothing else works.
The riv nut is Alu, so would some sort of treatment melt it away but leave the ti? I know it isn't pure ti, but some form of ti alloy, so maybe not such a good idea, just trying to think of other possibilities.