LHR-BHD sees either a short haul aircraft or a mid haul aircraft. The short haul have 3 seats either side of the aisle. The ABC seats squash together to make two wider seats A C and a narrow seat in the middle (which isn't sold). The DEF seats pull apart to make each of the 3 seats wider. There is no winding mechanism, just a lever on the side of the seat unit which is moved to release the mechanism, the seats either pushed or pulled and then the lever is locked. The mis haul aircraft used infrequently have proper 2x2 business class seats with leg rests and 50 inch seat pitch. These obviouslt cannot be converted into economy seats.