Vixen AP Equatorial Mount Instruction Manual page 23

PREPARATION
Using a telescope tube with dovetail slide bar:
This should be done after you finish balancing in the R.A.
1
While holding the telescope tube, turn the counterweight bar (or telescope
tube) by hand until the counterweight bar is horizontal.
The declination body keeps the mount in position.
2
Release the telescope tube slowly to see if it remains in place.
If the telescope tube starts turning as you release it, you will need to shift
the telescope tube either toward or backward until it remains stationary.
Note:
Do not loosen the dovetail lock screw and safety screw too much in balancing. This could cause telescope tube to fall and lead to injury.
3
Slightly loosen the dovetail lock screw and safety screw that hold the telescope tube on the dovetail slide rail, and slide the
telescope tube either forward or backword until it remains stationary.
4
Tighten the dovetail lock screw and safety screw securely
to hold the telescope tube in place.
Declination axis
23
Counterweight bar
Dovetail plate lock screw
Safety screw
Telescope tube
Stand still