National Geographic NG90EQ User Manual

 

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7) The counterweight balances your telescope and makes it easy to adjust and 
position. Hold the counterweight in your hand so you can see through the hole in the 
weight. Make sure that the black tightening knob on the counterweight is facing 
down. When you look through the counterweight, if you see that the hole is blocked 
by a metal rod, slowly turn the tightening knob counterclockwise to loosen it until you 
see that the hole is clear (see Fig. 8). Then insert the counterweight shaft through the 
counterweight. Turn the tightening knob clockwise to tighten it. Then insert the 
threaded end of the counterweight rod into the equatorial mount and turn it clockwise 
until it stops (See Fig. 9 and Fig. 10). 

                       

(Fig. 8)                                      (Fig. 9)                                     (Fig. 10) 

8) Attach the long slow-motion control knob to the chrome right ascension shaft as 

shown in Fig. 11. Tighten the small chrome knob on the slow-motion control until it is 
tight against the flat side of the right ascension shaft. Attach the shorter slow-motion 
control to the chrome declination shaft as shown in Fig. 12 and tighten it into position. 
Fig. 13 shows the completed assembly. 

 

                     (Fig. 11)                                  (Fig. 12)                                        (Fig. 13) 
 
9) Slide the finder scope into its bracket on top of the main optical unit. Tighten the 
two small chrome screws to hold it securely in position (See Fig. 14). 

 

 
 
 
 
 
 
 
 
 
                                                      (Fig. 14)