I'm glad you asked.
WHat? Scott, Jon, have you forgotten everything I've taught you already? Here it is, step-by-step, photo-by-photo.
First, fill up the gas tanks full, grab all your gear you plan to wear flying, and let's get going.
1. Find a cute little 20-somethings girl and hook up with her for a year or two. Stick her in the front seat. Take pictures. Lots and lots of pictures. It helps if you are disgustingly old, like you should be in your 50's. This drives people absolutely nuts, and you'll enjoy the hell out of it.
1a. So I added the close-up, just to make sure you fully appreciated the gyrotor hang test model.
2. Find a contraption to lift the gyro off the ground. Your local telecom company cable yard fork lift truck will work nicely.
3. Stick ANY old bolt through the teeter blocks that'll fit. The other guys are right, you probably shouldn't use the bolt you intend to fly with, but you don't need to get fancy. Welding tang onto it? C'mon, I thought that was what the astronauts drank in space, Scott. hehee, couldn't help myself.
4. Replace the cute, leggy female with your sour old ass. Hang a plumb bob from the same point you attach to, first the teeter bolt. I have enhanced the string in the photo so it is easy to see.
5. Next, hang the gyrotor from a second position, as seen here. Hang the plumb line from this position as well. I have also enhanced this photo for illustrative purposes.
6. Juxtapose the two photos one over the other with some photoshop software, and where the two plumb lines intersect you have your REAL center of gravity! THis is what REALLY matters. Now you need to line up your thrust line through the center of the prop and measure how far off it is from the COG. This machine is pretty much dead nuts, not more than 1/2-inch off. It doesn't get much better than this.
As for your HANG ANGLE, well, I don't know about any such universal numbers for all gyros like 2 degrees, but I do know that Air Command recommends for THIS machine anywhere between 1 to 4 degrees from vertical is acceptable. As shown, this machine is nicely within that spread.
If you doubt my word, go back to photos 1 and 1a. I think you'll begin to see the wisdom of my ways. I may be crazy, but I sure have more fun than sane people.