New Holland Big Baler Knotter Service Manual - Gason slasher. 10.7m (35ft) 2016 Gason Cropper topper. Only used for 3 seasons, approx 6000 acres. This machine is practically new, well looked after and shaded.. Helpful information and resources on John Deere tractors from SSB Tractor, a leading provider of tractor parts, manuals, implements and toys.