Wow, thats a good one!
Not that I can say anything. I had to change out my spur on the revo and when I was done the back of the spur was touching the tranny case. So I scratched my head a bit and looked at it really good. Everything was on right (

) so I decided the spur was just weird and placed some small washers between the spur and the slipper to space it out.
Later when I was cleaning up I found this shinny metal disk on the floor, yep the disk that fits on the hub and the pads ride on it... Glad I did not drive the truck, I can imagine I would have screwed the slipper up...
Sometimes we are not at our best when working on these trucks...