Greetings all you good people, I have created the part below, usinfg a control vertex spline for the top bit. It seemed to work bettrer than theinterpolation one. It was done in one of those whirls of confusion where I even managed to get it fully constrained!
I need to do a few more similar parts, and I'm really struggling to find info on working with these splines. I have a skill builder (I think) for a symmetrical spline - which of course none of mine are.