The Wessex WFM Series Flail Mowers. For control of dense vegetation, long grass and woodland rides, the Wessex WFM Flail Mowers are a real tough performer and are perfectly suited to the job. Hammer flails pulverise tough material while a full width adjustable rear roller maintains an even cutting height. These machines can be used in-line or offset, and are available to suit compact tractors from 35hp. The Wessex WFM flail mower is the machine of choice for the discerning smallholder!