http://www.wonwinglo.scale-models.net/id42.htm
I have prepared a tutorial on how my own carburettor assembly was modified,at the same time the engine droop scenario has been rectified with an extended bearing,I would stress that these are un-official mods and nothing to do with Hachette ! the system utilises as much as possible of the original parts and just needs a few pieces of brass or alloy tube.
Any questions and I will be pleased to answer them.