After "milling" the 22mm and 40mm holes in another piece of aluminium, the inner crush plate is clamped beneath with a sleeve through the centre to line everything up, 7/32" holes are marked and then drilled through the inner crush plate on the drill press. These are then tapped to accept the AN4 bolts which fit snugly through the 5 slotted holes in the plastic hub that you can see in previous pics. Again, I just have to make do with the tools at hand.