Here's a pic of how I got the drilled out bolt from the top triple clamp after the ignition barrel was removed.

It wasn't an allen key it was one of these.

Good luck.

it is a " torx " screw

Cheers for that Bic. I am going to remove everything today, fingers crossed the new lock will arrive today or tomorrow at the latest.

Oh and thanks again for the yoke. You da man