[justbecause]

So it's pretty clear that whatever way I tighten it leads to a different result.

If I screw it tight, open the screws, screw it tight again, the laser falls to a different spot (without rotating the laser itself in the tube or even so much as touching it).

That means my eyepieces (which I never tighten as much as this laser) have the same inaccuracy in their actual placement.

Should I get a solid and sturdy similar result every time I insert the laser as long as the mirrors haven't moved or is the only important thing that IF the laser falls into the centre of the primary, the laser also centres on the target of the laser?