More news at last.
My client can print these now. Matt black. He's made some samples and the favourite has a 17mm ball which is removeable for possible future additions like maybe a phone holder.
Picures here:
https://www.tm-img.com/image/LhrNphttps://www.tm-img.com/image/LhEoShttps://www.tm-img.com/image/LhQmHhttps://www.tm-img.com/image/LhfHOHe's not trying to make money, he's doing it as a favour for me. They come out at £20 plus postage.
Sorry, posted now in for sale section.