As I said in my last post we decided to support the main pivot externally which is exactly what they did on the full size. I assume for a similar reason. We tried to keep it as scale as we could within the confines of actually having a functioning part. The top hat is removable to allow the main pivot to slide out if required for maintenance. Like before all the tolerances have been reduced and it the top hat runs on a PB bush. This works as expected and removes all play in the pivot.
_DSC8171 by Alex Jones, on Flickr
IMG_0379 by Alex Jones, on Flickr