Awhile back I promised you a demo of the Mathias Wandel Pantograph.
Well I ran across this PDF of our October Woodworkers club NewsLetter where my cousin Paul ( builder of my pantograph) and I did a presentation on it. He explained the build, and I did a live demonstration. It is about half way down the pdf.
http://nwwoodworkers.org/newsletters/October 2016 Newsletter.pdf
Herb