Thanks for you post, Spinningray. I especially hoped to share some thoughts with you about this whole thing. Somewhere in the two hour plus range I started to hear some different noises. When the top slowed down quite a bit I could hear something shifting inside. After a while I figured out that the piece (nut) used to tighten the tip into the body was off. Like a dummy, I didn't check it before I started!!! It shifted around a bit and threw the balance off on occasion but generally everything stayed together for another hour or so. When I got to three and a half hours and the tornado alarm was going I was happy to quit. Sure enough, when I looked inside, the nut was off and everything was pretty loose. I put it all together again and tightened it and checked it on several occasions. It all seems to be fine again. Actually, better than it has been recently. It must have been working loose for quite a while and I didn't notice. The bearings seem to be fine and ready for another go, but not my body! This last run wore me out more than I thought it would. I'm going to wait another couple weeks and see if I feel like doing it again. The people at the school are great and say they will host me for another attempt if I want. We'll see.