Blue Stone dust from a local quarry was put down. Hand tamped. As you can see the Rebar templet is placed into the center. I used a steel tube which I hammered into the middle making sure it was Vertical with a level. The rebar is the only thing I was able to make based on the limited information Dan Supplied in his book. As he stated the shape was like a question mark using a 6 ft peice of rebar. So it was a matter of bending the rod. I got together with a friend who has a mech shop. We used his exhaust bender to help with the shaping. We were shooting for a 2 foot high arch on the out side.
Having the rebar in the pipe allows for easy spinning. As I begin to build.