Hi DD, that's very kind of you, i think ive solved the mystery of how it actually works. Although i may have a few more questions on it. it is very impressive , i must say. Are your pivot points plain bearing, do they have have bushes.? I'm just curious to see what you've done, how intricate it is to build and how effective it is in its performance. I do like the idea, so im impressed enough to want to consider it. It is great, and now that ive figured it out its even more appealing. ....Thanks DD.