MONROE - What started as a hobby recognizing the history of farming became an annual event for Chris Guthrie, founder of the Thunderbridge Flyers, when the antique thresheree in Argyle began six years ago. "It was just a bunch of friends with tractors and it turned into a full-fledged tractor-engine show in Argyle every year," Guthrie said. "I've got a crew that has been with me since the beginning."