Fiber Laser Focusing Stick - 300mm Lens

This is a focal stick for a 300mm f/theta lens.  It has adjustability between 453-473mm, with the nominal focus range of a 300mm lens to be ~460mm.  It is more rigid and requires only one M3 screw and nut to solidly lock in place (or you can just glue it).  I suggest once you're happy with your adjustment you CA glue the stick together to lock it in.