I've just videoed myself trying to produce the bowing action without a ball and it's very interesting. I'm going to try and take that onto the field this afternoon against my son and see how it goes, more to come this evening with vids and pictures. It's all very interesting... This is a locked video so I think you can only access it via a link that I share. But I though this looked very promising in the context of the re-construction of my bowling action.