So i have been using a 1.5″ x 3.5′” PVC reducer as the housing for the motion sensor as well as the stand for the billiard ball. I really could not ask for anything better. The one problem i always had was the distance between the motion sensor lens and the billiard ball According the ADNS-9500 technical manual it should be at a distance of 2.4 mm with a tolerance of +-0.22. Really? 0.22 mm tolerance. I realize in the grand scheme of things a tolerance of four tenths of a millimeter is really not all that precise. However its not really possible to eyeball that. I was having trouble getting a good measurement so I created a cutout. I have always really like cutaway models. So after creating the cutaway I was able to get some accurate measurements. It turns out I need to cut the upper PVC ring so it has a height of exactly 8 mm.