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Probably a loose/sloppy focuser unit - check it by holding the end of the collimator gently and try to push it very very slightly - if it does move then there should be a tensioning screw/knob underneath the focuser that you can tighten (not too tight though) which will stop the slop - and then collimate again
HTH
Cheers
Bill
Last edited by Visionoz; 22-04-2011 at 11:51 AM.
Reason: Corrected spelling and added focuser
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