Only it's trouble of a more serious sort. While tightening the one screw, after having to bleed the engine before starting as these bleed screws are still leaking slightly, the screw sheared off, leving some of it's thread still in the injector pump... As the thread has a hole through it I can't even turn the fuel on so I can't start the engine...

I'll have to take the pump off, which doesn't look too easy, and have a look. Hope I can remove the thread then, if not I know a cheap, helpful chap who does work on these pumps..

How annoying......