This Kromer Hi-Boy sprayer is mounted on a 1957 John Deere 420T with crawler final drives. The rig was shipped as a kit to Kromer Mfg., Minneapolis, for conversion to a Hi-Boy. "I had one just like it in the 1970s when I started farming," says owner Steve Eilers, Martinton, Ill. "I sprayed 600 acres with it. Then I sold it and got something bigger." Years later, he saw a photo of one in a book identifying the rig as one of 10 built. "I kicked myself for getting rid of the one I had, and started trying to find another one," he says. This one turned up on eBay. "I spent the winter fixing it up. We had to send the brakes to Chicago to have the bands relined, and rewired it. Otherwise, it was operational."