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Sounds frustrating Robin. I know Brendan replaced his spider and 2ndry assembly and swears the whole thing is much more robust now.
My only suggestion to pin it right down to this assembly would be to do your laser on to paper test again (primary removed), but with tube on a table rather than mount. Then roll the tube 90 degrees at a time and see if you still get the movement. With table supporting tube that would pretty well seal the case as spider+secondary problem surely? Sounds like the focuser is plenty rigid for holding a laser steady, assuming definitely no movement in focuser barrel when locked.
Heck, I only have to look at my focuser and alignment moves. Once you're tracking an object these errors (although frustrating) aren't really going to matter too much. I'm pretty sure I see a tiny amount of mirror movement from one side of meridian to next however such that you don't get objects in FOV exactly. In EQMOD you can do alignment stars for each side of the pier and that fixed my probs in that regard nicely, and with plate solving its show stopper. Small price for light sucking power of a Newt?
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