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Cut a piece of grease proof paper that fits neatly over the outside of your objective. Draw with a compas to get neat circle. Mark a centre dot where the compas point was. Place this paper over the objective lens. Remove diagonal and place a laser collimator where the diagonal was so that the beam point lands on the paper mask. Loosen the focuser screws that hold the focuser on the tube and manipulate the focuser till the laser spot lands directly on the centre spot of the paper mask. Tighten the screws to lock your focuser in place.Your focuser is now aligned with your objective lens. Seeing that your objective lens cell has collimation screws, star test out of focus star image and adjust to symmetrical pattern achieved.
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