I'm trying this out but my throat hurts, and it sounds as if I'm singing with an egg in my mouth ...

I will keep the idea in the back of my mind for future reference, but sometimes you can think too hard about a skill. I think maybe I was getting it more or less right aleady, and the presence of the phantom egg has just spooked me. I suppose we all have our mental tricks, and some work better than others for each of us. I shall return to the one about singing from a point between your eyes, which sounds equally strange but less uncomfortable.

Marje