The Mystique of the Plow
http://www.farmcollector.com/Tractors/The-Mystique-of-the-Plow.aspx
Dennis’s die project –the plow handle hinge clips, along with his puzzle ball plastic injection mold he received a second place award for in the National MasterCam contest.
http://www.cvtc.edu/Programs/DeptPages/MachineTool/Tool%20&%20Die%20Projects.htm
John Deere parts catalogue search (just type in model number under search and scroll to find). This is a great way to look at part diagrams and find part numbers from home.
http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.HomePageServlet_Alt