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Hi Mick,
Adding to what Bill mentioned. Wind the focuser right in. Insert the laser and hold it flush against the focuser. Spin it around by hand slowly - does the beam stay centre or move around the primary in a circle? If it stays centre, tighten the fastening screw - does the beam move when you do this? Often, these lasers have quite a bit of play in the focuser.
Regards, Rob
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