I'm also trying to take the class for the Tormach so in a way I guess this was a test of my milling skillz B)
Files (specifically the Half-Round File)
Step 1: Measure!
(It works as long as you trust yourself!)
Step 2: Na-na-na-na-Mill Time!
Carefully use the X and Y axis (Use them simultaneously to feel like a BADA$$!)
Cut out the "Yang" negative and Mill the Bottle Opener Hole.
Step 3: Flatten & Shear
(Leave some room on your Work while shearing to shape on the Grinding Bench)
Step 4: Grind, File & Finish!
Focus attention on the lip of the Bottle Opener
Shape the Flathead accordingly
Step 5: Ta-Da!
(The Flathead won't work for all jobs so stick to just small stuff when using it)