A bevel gear shroud assembly comprises a frustum shaped shroud portion, first and second rib portions and one or more fin portions. The frustum shaped shroud portion has a cut-out sector, the cut-out sector having opposing, radially extending first and second sides. The first and second rib portions project inwardly from an upper base of the shroud frustum and normal to the inner surface of the shroud portion, and are spaced apart from one another to form an annular trough therebetween. The or each rib portion projects inwardly from an inner surface of the frustum shaped shroud portion between the first and second rib portions, and the or each rib portion extends circumferentially around the shroud portion.