Thanks guys and so sorry for the late reply in this, i've been away. I see the extra point at the top of the middle spline there that has crept in so that makes sense of that mystery thanks. It is disapointing though that the shape cant be achieved just using those three splines, when i try and do it moi gets itself confused and brings in an exagerated twisting in the middle but the rest of the shape is ok. I guess its a bit of an awkward shape but annoying all the same as I would have thought this type of work would be where moi/nurbs would come into its own without resorting to work arounds.