Flux mentioned if the magnet disc was potted,   well, it's not. Magnets are epoxied and the disc painted. Only my test machine so it's fine but now I know for the new machine I'm working on. The machine I'm building now has four bolts in addition to the center bolt. I need this to make sure that with a second magnet disc the two stay aligned. With only a blank steel disc on my test machine there was no need to have more than the center bolt as the discs did not need to be aligned at a certain point.

     So for my  machine in progress I will have a thicker, stronger stator, potted magnet discs, four bolts between discs and I think I will also try a large plastic bushing on the center shaft between discs for dampening any noise. I won't expect silence but I will try to eliminate unnecessary noise.

     On a side note I have finished carving the wooden blades for this machine. They came out great. I used Ed's plan, here

http://www.windstuffnow.com/Blade-layout.pdf

     About the time that my arm was getting tired from patting myself on the back I had the humbling realization that the instructions were so good anyone following them would have the same results I had. I asked Ed about the TSR of these, (I scaled them down to 36" for 6 foot from his 39") He said they will run about 6 maybe a little higher since I made them shorter. My greatest motivation was the fear that responses from Flux would have a line something like, "I forget what your doing, are you still playing with PVC blades?" Here's a couple pictures.