Rotary F1 Oil change

Gidday . I am trying to suss out how to do the oil changes on my F1. The only service notes I have are crap. I figured out the transmission drain bolt and drained 700 mls out from the hex bolt and I know where to top up from the black plug. The other transfer case one has me mystified as I removed the allun bolt as the manual described and nothing came out. Now, there is either no oil in the case or I have removed the wrong drain bolt. The manual says nothing about where you top the case up. Any help?

If nobody knows then I suggest you ask these people?

http://www.startright.co.uk/
http://www.nortonmotors.co.uk/