The invention relates to an electromotive direct drive for one cylinder of a printing press, which cylinder is held in a connecting construction with a journal via a roller bearing, a rotor of an electric motor being connected fixedly in terms of rotation to the journal, and a stator being connected to the connecting construction. Digital pre-distortion is performed by applying a signal to a recursive system to generate a state vector; providing the state vector as a feedback value to the recursive non-linear system; and applying the state vector to a second function to generate an output signal, wherein at least one of the recursive system and the second function comprise a non-linear function. The invention relates especially but not exclusively to a diverter assembly connected to a wing branch of a tree. The consistency of the gel material can be varied to suit any particular activity or requirement. Preferably, the seal layer is formed upon brief UV irradiation and comprises an acrylate, a methacrylate, an epoxy, a urethane, andor a thiol-ene polymer.