I needed to install a new light sensor on my front lawn lamppost, but the one I bought didn't fit in the old one's mount. Hence this thing. I used some J-B Weld to make a watertight seal between the sensor and the holder after installing it.Measure your lamppost's diameter, the size of the screws you'll use, the separation of the screw holes, and the diameter of the new sensor. Update the relevant values in the SCAD file. You'll probably have to play around with the height, depth, and angle values to get something that both looks good and is sturdy enough. The part is rotated so that no support material should be needed.