Below is another cool technique you can use with your fly press and it's vertical index -
the check nut. You make up a small set hammer with the edges relieved and control the
depth of penetration with the check nut. You can now make a stair step effect and can make
square indentations, or turn the tool 90 degrees, then you have a square with the diamond up.
This is a fast way to make very attractive effects.
Below is an example of the stair step and square indentations