Sewing a holed button with your machine

I was told this can't be done, but according to the book that came with my 319K2 it's relatively easy. After a false start, I learned the art of putting on a button with a machine (I hate doing it manually).
The pre-requisite abilities of your machine are two:
1. Disengage the feed dogs. If they work as normal they'll move the button so the needle and button will both break. If you simply set the dogs to not feed (zero), they will still push the button up and will break the button. They must be disengaged and lowered. All of my machines have a height adjustment for the feed dogs and once lowered below the throat plate, your button will be safe.
2. Zig-zag stitching. Your machine must obviously be able to stitch from one side of the button to the other. If the button has four holes, a diagonal stitch is best, if your zig-zag will reach.

Here is the relevant page from the 319K manual:

319K Manual page 70

The instructions are the same for any machine, but disengaging the feed dogs is different for other machines. A friend of mine has a 1952 Phoenix 250 that has a very convenient lever on the front of the machine which lowers the dogs. I'm not sure if putting it to 0 stitch width is even necessary, but I did it anyway.

Slowly hand crank while adjusting the zig-zag width until you're certain the needle will go into both holes before engaging the motor. Note the instructions for adding a shank.

I'm confident, after 10 buttons or so. It saves me a load of time and produces a consistent result.