Hey Tony,
So attached is a photo of my injection pump and throttle (purple arrow shows where my throttle lever was, just removed it).
You can see there is a load of putty all over the star bolt (green arrow) by a previous owner which is concerning, I hope it was just a lazy fix and not something more serious.
What I'm wondering is if I need to remove the (red arrow) housing over the maximum speed stop screw to undo the rest of the throttle stuff to get to the o ring inside or if I do indeed, need to undo the green arrow bolt?
Thanks again!