That's fantastic. Love camera hacking & building myself, more than even using. Was just off to the hardware store last evening looking for some ABS plumbing fittings to attach a newly arrived helical to my little 60mm refractor. Found what I needed and now I can mount any M42 mount body to that 700mm air spaced doublet. Don't have any idea what I'd use it for.........but that's not the point is it.