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Ok, my guess is that it is the slop of the collimator in the focuser that is the main issue. Personally, I would just use a simple collimation cap to start of with. I have one around here somewhere that I could lend to you and also a semi decent laser that may have a better fit. Let me know and I can pop them in the mail to you to test out.
One important principle with collimation is that a laser is not the be all and end all. I use one to quickly check that everything is still aligned but regularly do a full collimation with sight tube and cheshire to ensure it is all still good.
Also, please remember ( and this will grate against your Germanic personality!!) that while collimation is necessary, perfect collimation is often not and spending hours getting it just right is often a waste of valuable observing time. Get it as good as you can, then enjoy using your scope!!
Malcolm
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