Step 6. Install counterweight
Before putting on CW, make sure the mount is at its zero position, i.e., CW shaft points to the
ground. Insert Allen wrench to lock the RA axle and disengage the R.A. Gear Switch to set the R.A. axis
free before loading the CW. Remove the CW Safety Cap at the end of CW Shaft. Glide the CW over the
shaft with the larger opening facing down. Tighten the CW Locking Screw to hold the CW in place. Place
the Safety Cap back onto the shaft. Move the CW to the bottom of the shaft and tighten the CW locking
Screw.
GEM28 comes with a 10.4 lbs (4.7 kg) CW, which should be sufficient for an 6” scope with total
payloads up to about 12 lbs. Use extra CW or CW Extension Bar to balance higher payloads.
Figure 14. Install counterweight
Step 7. Install telescope
GEM28 has a 3.5” Vixen dovetail saddle, with a Center Adjusting Block. This can be used to
accommodate dovetail bars with different width and keep the OTA centered. Release the locking screws
(blue circled) on the Center Adjusting Bar first. Adjust the setting screws (red circled) to move the center
block in or out. Then tighten the locking screws. Tighten the set screws at last.
Figure 15. GEM28 Vixen dovetail saddle with Center Adjusting Block
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