OK
Being the clever Vegemite that I am I have worked out how to dis-assemble the diaphragm plate from the spindle. Once that is done the rest of the tear-down is pretty simple. I read somewhere that the nut on the end spins off so I went looking at how the spindle must be stopped from rotating so you could do this without grabbing the spindle with multi's etc.
Obviously the diaphragm chamber will already have been separated by removing the compression band. All I did was poke a pop rivet nail down the inlet fitting and engaged a hole I noticed in the diaphragm spindle. I guess some coat hanger wire would most probably fit too, but anyway, once the spindle is locked with the 'pin' in it the plate can be turned in an anti-clockwise direction and the nut will spin off the end and all parts withdrawn.
Sorry if anyone is confused but it all seemed pretty easy.
Now I am not saying you should attempt to rebuild the booster (although I can't see why not) but at least you've got it apart and can refinish all the parts etc.
Cheers
Dave Mac