Thx mptak!
Yes, I have download some and reversed engineering. It really helped.
I find a lot of this is trial and error. Love puzzles. : )
This really helped: https://sites.google.com/site/sketchyphysicstutorial/
The car tutorial, put things into perspective.
Once you know how it's easy. I just figured out how to make a table turn that supports a controlled seesaw. Huge personal satisfaction!