Building the pantograph mechanism for the pantorouter.
http://woodgears.ca/pantorouter/pantograph2.html
You can buy the plans for this (updated) pantorouter here:
http://woodgears.ca/pantorouter/plans
If you bought the pantorouter plans in the past, you can use the download link that was emailed to you at the time of purchase to download the latest version.