Geberit kappa cistern parts

[vivienz]

Our downstairs lav is one of the things that my plumber left unfinished and I've finally got my correct flush plate for the cistern.  After tearing my hair out trying to fit the thing, I've realised that there's a bit missing from the cistern.  I don't know the correct term, but it's like a linkage between the push rods and the lift up bit in the water itself that causes the flush.  The part itself is nowhere to be seen and I can't fit the flush plate without it as the push rods don't have anywhere to go into. 

 

I've looked at the tech drawing on the Geberit site, but it only shows the box with the flush mechanism in it, not a detailed diagram.  Can anyone advise where I can get a diagram and or part number, and where I can get the individual part from? 

[vivienz]

Panic over!  Until the next one, anyway.  The bit I'm after is called a support block, should anyone find themselves in a similar predicament.