It is a stabilized and dyed box elder burl from Craft Supply.
Ok, now that I have the blank with a hole that fits the inner diameter of the casings and it is turned to about the final outside casing diameter. I then need to cut the matching angles for the casings.
You need to really look at this photo. On the end under the saw I have not cut the angle. On the opposite end the angle has been cut. The first angle is easy to position. Just slap it in the vise and cut. The second angle need to be exactly opposite (in this version) to the first. How do you position it correctly?
Well what I did was to take a square (very square) piece of metal and place it on the opposite end of the blank and rotate the blank until the angle is flush all the way around the square block. You can see the metal square block and how the angle fits in the photo where the text is pointing.