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The power connector on the AC adapter and external battery packs is too
loose on most NexStars. This can lead to the power cord disconnecting
during normal operation and thus you will need repeat the alignment process.
To prevent this, you can replace the connector on the power source (AC
adapter, battery pack, etc.) with a similar looking connector with an inside
diameter of 2.1mm and an outside diameter of 5.5mm (Radio Shack part number
274-1569A). Connect the positive side of the power ( + ) to the inside
conductor.
In addition to replacing the connector, it also helps to spread the two
halves of the pin in the middle of the power socket on the scope's base.
Be careful not to bend it too far or you may break one of the pins.
Also be careful not to turn it as you may break the solder connection on the
inside of the mount.
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