The inner part of the mount ring forms a bearing surface for the rollers. The rollers are flanged to hold the cell in the mount ring. During setup, one of the bearings is removed so the cell can be lowered through the ring and come to rest on the rotation pads located under the assembly bolts on the underside of the base plate. It is then screwed back in place so the tube won't fall out of the mount. To simplify handling and assembly, I made a carrier for the mirror cell.
Mirror cover and cleaning An ABS plastic mirror cover fits snugly over the mirror.
It is placed over the mirror or removed from it after assembly or before disassembly. Because the mirror is all-metal and won't rust, it is easy to clean. After removing the plastic cover, water from a hose is poured over the mirror's surface, rinsed with distilled water and then the cell tipped up so most of the water runs off. The remaining small drops of water are dabbed off with a folded and pointed paper towel. This model shows the mount ring, the cell's base plate and triangles, all Delrin-Teflon bearings, the bottom end ring of the tube and the tube's attachment bolts.