[Paul240480]

Hi all.
After being involved in the cam-belt change of my 240, being expertly shown how and guided by Mike Brace I felt confident enough to begin the same on my 480.
However, I've only got as far as needing to remove the 'plug' to the right of the dip-stick, in order to lock the engine at TDC.

Try as I might I cannot get any of my tools onto the head of the bolt. I've tried long & short sockets, they get 'fouled' by a stud & bolt just below. I've tried open spanners, ring spanners & off-set ring spanners. No matter how I try I just cannot seem to get anything onto the head of the plug in a way that I can then get some 'purchase' on it.

Has anyone got a cunning 'tip' on how to remove this thing please.
Yep I am a novice at this mechanical stuff & today it's really showing!