Nice work. Just a thought, did you loctite the blanking studs in to stop them dropping into the diff casing?
The slight gap between the lowering block and bottom leaf could be to prevent the rest of the leaves in the stack from being clamped in place and allow them to move laterally. As far as I'm aware, the bottom leaf should be fixed to the diff and the rest should be able to slide from side to side -
http://www.canleyclassics.com/techni...swing-springs/
Anyway, keep up the good work.