The treatment of openings in these towers, other than the mid-wall shaft windows, is open to few variations. Western doorways are low and narrow: large stones are used in the jambs; and, though the heads are arched, the actual opening is covered by a flat lintel. The roughest of these openings is in the tower at Winterton, where the head of the doorway is formed by a huge stone, cut with a segmental curve on its under side to give the effect of an arch. Flat rectangular hood-mouldings of small projection sometimes follow the curve of the doorway arch and meet the extreme edge of the impost-block. At Clee, one of the best towers of the group, such a hood-moulding bounds a doorway head of two orders of voussoirs, the lower slightly recessed beneath the upper; but such refinements are rare. A similar recessing of a lower band of voussoirs occurs in the tower arches at Clee and Scartho, but in no case is it accompanied by any attempt at moulding the arch or recessing the jambs to match. An edge-roll was worked very tentatively at Nettleton along part of an unmoulded tower-arch, but was abandoned when about half completed. An ambitious and unique attempt at recessing, in the chancel arch at Broughton (now the arch from the tower into the nave), remains as a monument of the failure of the Saxon mason in his search for means of architectural expression. Both orders of the arch spring from an undivided impost-block, and the shafts, which should bear, and are intended to correspond to, the inner order, are stranded on either side of the back of the opening, with their heads left bare and their function denied them. As a rule, in doorways and tower arches, the mason was content with a plain unmoulded arch, springing from projecting impost-blocks on the top of jambs, the dressings of which are simply the quoins of a rubble wall. He varied the proportions of his tower arches, giving them great height, breadth, and dignity at St. Peter-at-Gowts, building them tall and narrow at Clee, Scartho, and Holton-le-Clay, or with rather less elevation and rather more breadth at Rothwell and Cabourn, frequently allowing them, as at Cuxwold or Alkborough, to remain low and rather broad in proportion. These variations of the tower arch constitute one of the most interesting features of this type of building: they introduce an element of individual design, and the loftier form of arch often produces by its mere size an effect which is not due to any obvious architectural virtue.