Hi Dave--I do not wish to change my story. Right now it's Saturday morning, I have a contest starting in a few hours, so will have to come back when I have the time to expand on my remarks. The only argument you offer in opposition is the Webra manual. The diagram is fine, but limited (only 2D, whereas a 3D cutaway animation would be a lot more helpful). The Webra product is a fine piece of engineering, at least as far as my own satisfaction with it goes. Our argument is really over the little statements accompanying the diagram in the Webra manual. Dar says they are misleading, and I agree. More later.