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Yes it is OK to hold the tube.
Or one of the two knobs may be easier.
The rotation of the Earth, when you see the effects of it like this (under high magnification) it is an eye-opener isn't it!
That sounds pretty close to normal.
If you start to use heavy eyepieces, you may then need to add some weight to the base to help balance it out. Some people use magnet blocks.
I personally like to balance the scope before use, so that I can have the tension handles loose enough to keep nudging the scope easily and smoothly, to keep objects within the field of view.
It becomes second nature after a while.
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