Spencer Yost has written several tractor-related books, including How to Rebuild and Restore Farm Tractor Engines and How to Restore Your John Deere 2-Cylinder Tractor , and is the creator of Antique Tractor Internet Services (www.atis.net), the original antique tractor website. A computer-industry consultant by day, he lives in Pfafftown , North Carolina . www.atis.net