seems to me that the guy that built the engine before me was a bit of a t$@t...
just replace the two pressure switches and was having a browse around my engine, to my utter dis-belief, i found that at the top of my gearbow was a hole (see pic)
its threaded and so im jumping to the conclusion that it should have a cap... anyone know the part or number?
whats really worrying me is that i replaced the cyclinder head pressure switch and oil has run down the side of the head and possibly into the hole...

any ideas?
rob