[Lynn Eades]

I am guessing there may be a washer missing from under the bearing,or some other assembly fault, with your cam plate. The English/ Canadian carriers, have very little clearence for the bottom end of the clevis pins, but the Aust design allows more room, and hence have bigger dia. split pins, and longer ends to the clevis pins.
Your long clevis's are virtually rubbing on the floor.
Can one of you Aussie guys put up a parts breakdown for the cam plate, showing whats there is in the way of washers, spacers etc.
Ron, what you you tell us?