This is the back of the telescope. In this view you can also see the 1-1/4 inch star diagonal and a 26mm Plossl eyepiece. Since first building this telelscope I have replaced the focuser with a commercial one. This was only done to make observing at star parties easier. I still have the flush valve focuser and intend on using it with my next copyscope. The ruler is 6 inches long.