Hi Rob, the last photo was my best attempt at getting a photo of the mech, but no room to get camera in and it's covered in grease which doesn't help, but it seems to be similar to a axle diff, I guess it's so when you turn one end the other rotates with it, there must be a tube with the shaft protruding for the gear to slide on then a cotter pin to hold it in place, no idea how you would get at it without removing the lower engine cowling, maybe more after that........ good luck with that one! if it were me I may well opt for Micks suggestion of a length go 4" fence post.
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