The previous advice sounds right to me, vector (welcome, by the way). A little judicious tightening and loosening of the centre bolt will also make some difference. Mine still isn't quite right although I'm getting there. There's a fine balance between having the whole assembly move too easily and having it move jerkily due to excessive tension.
To do it properly means having the tube assembly mounted - it doesn't need to be secured - for testing and then lifting it off to make adjustments (which, because I'm lazy, I have done little of). I'm assuming here that you don't have a fork lift or some other means of accessing the bottom and top of the base assembly without removing the telescope from the mount.
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