Hi,
I do not have a digital copy of the manual on me, but it is in there if you maybe kept the box?
The screws have threads on both sides, one side shorter than the other and the shorter side screw thread is bigger.
You just screw the short end into the MB side then drop on the block, use the white washers and then the thrumb screws to secure it down.
If you need further help, I will try to dig one up or take a picture of one here.