Neat idea, Philippe, thanks! ;-) But it's not quite there. The centre moulding obtrudes. Peter .......... You might find something there diabolo <https://www.google.fr/search?q=diabolo&source=lnms&tbm=isch&sa=X&ved=0ahUKEwj7-suIubTaAhXJRhQKHbUmCykQ_AUIDCgD&biw=1173&bih=973> Amities Philippe