Even with a center drill, it will be difficult to get the initial divot/hole centered. This is due to the thread and hole exhibiting an 'off-center' appearance. Looking at it as it is installed, the thread shows the apex on one side of the hole/screw and the root on the opposite side.
If the screw is 'finished' flush with the stock iron then there won't be any dome.
A tricky issue even for an experienced machinist.
I'd give it to Gerry Tomek!
