This is theSecond spin station I have machined. It is 3 3/8” diameter and 3/4” tall. Each surface has been machined. the top (under the lens) has narrow concentric circles. The bottom is stepped in to allow for irregular surfaces so only the outer edge makes contact.

This includes one 75mm lens (same ones available on amazon).

Since this is titanium, its possible to anodize the piece. If you would like yours anodized, please let me know.