Overnout

I don't have pictures handy, but the JC mount is best mounted with counter sunk screws-in the UK we used M4, but 6-32 CSK if thats what you get.
You will not get the screw heads completely flush as the ali is not thick enough.
To protect the turbine case I cut a strip of 1/32" ply wood the same width as the mount and around 4-5" long wrapped around to allow the screws to "locate" in its thickness.

Regards

Dave Wilshere