Insert M6 bolt from the front. Now turn the whole thing over, placing on a hard surface (eg workbench) so that the M6 bolt is resting on the workbench.
Now tap in a Torx wrench bit (gently). Because you have the M6 bolt on the other side, this won't drive the bolt any further into the fork.
Once the Torx bit is in place, unscrew gently whilst pushing the fork gently downwards, so that your M6 bolt helps push the nut out.
failing that might get a bit more involved with the hammer, to be honest it was a bit of a token effort first time round, just feels a bit dodgy whacking carbon stuff.
Out of interest how does coke measure up against plus gas? (what I used before)
Well we use Coke for siezed in glow plugs on Diesel engines because wd40 doesn't work. It's to do with the chemicals in Coke. Pretty bad really considering we all drink it.
Insert M6 bolt from the front. Now turn the whole thing over, placing on a hard surface (eg workbench) so that the M6 bolt is resting on the workbench.
Now tap in a Torx wrench bit (gently). Because you have the M6 bolt on the other side, this won't drive the bolt any further into the fork.
Once the Torx bit is in place, unscrew gently whilst pushing the fork gently downwards, so that your M6 bolt helps push the nut out.