A friend is retiring and sold a nice one owner 6620 for $10,500 Saturday. 15 foot head brought $4700 and cornhead only $2500 or so. My F2 will stay with it and would not bring near that amount. Good point on engineers. Been patting them on the back while cussing them all my life. If they were with you in the mud, the blood and the beer to repair what they designed they would have a new look on life I am sure.