Driving impression: Kongskilde Delta Flex cultivator The rigid-tine Kongskilde Delta Flex cultivator looks, at first glance, much like the company’s now well-established Vibro Flex 7400. Though built to tackle stubble busting on heavier land, the Delta Flex is, however, more than just a rigid-tine alternative to its Vibro sib, as James de Havilland discovers on witnessing a 6m trailed model undergoing its final trials