I believe that jig is available through Pacific Tool
I've had this fixture that I built for about 5 years. I must admit it's not 100% my idea. I seen the original one Nate Lambeth built and built my own just by looking at his. It took a little bit of design getting the angles correct. The one Pacific Tool has doesn't have any support under the handle. You'll need to center drill the knob and use a live center for support. I built mine with enough support and clamping surface I don't need a live center. .020" per pass at .006" per rev. it only takes about an hour to set up, turn, thread and install the new bolt knob.