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If you have a collimated laser collimator, put it in the focuser, check that the dot is hitting the centre of the objective and firm up the screws attaching the focuser to the tube. At this point the return bean should be hitting the centre of the collimator target, assuming the objective is properly square to the tube.
To find the centre of the objective you can make up a paper mask with a centre dot to put over the dew shield.
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