Opposite page clockwise from top left: John Deere Model 20, Play-Trak and Case 1070. The fully hydraulic John Deere was the most complicated of Bob Rentzel’s pedal tractor conversions. “I worked on it for more than three years,” he says. “Everything about it is very complicated. My stepsons and a neighbor helped me with it. The hardest part was stuffing all the components in that little body. A lot of them cleared by just a fraction of an inch. That was really meticulous, but it works beautiful.” The Deere is the only one of Bob’s units with reverse. The Play-Trak is one of the earliest of that model made and is very rare, Bob adds.