Sky-Watcher DOB16 - Manual (Page 8)

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3. It can be a tricky task when assembling the end ring (and mirror cell) back onto the tube.
The complication is that the large diameter and thin metal of the tube will cause the tube to
become somewhat out of round once the end ring is removed. To assemble the rear end ring
(with mirror and mirror cell now connected) to the tube, position the lower section of the tube
up vertically so that the raw edge of the tube is up. Line up the threaded holes in the edge of
the end ring with the holes in the end of the tube. Then, lower the entire assembly onto the
tube. (Be careful to avoid finger pinching during this step.) There may be a bulge in the
perimeter of the tube that obstructs the end ring from fully seating onto the tube (Figure 3).
Simply press the bulge down and the entire mirror cell assembly should seat onto the tube.
Now, replace the eight Phillips screws that connect the rear end ring to the tube.
Fig.3
Figure 3. Find the area of tube that is bulg-
ing out and obstructing it from seating in
the end ring. Press on the bulge to force
the tube into the end ring.