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hi Nigel,
be wary when using a laser collimator. Most of them come out of their boxes poorly aligned to begin with! They need to be spun in a lathe chuck or somesuch and the beam alignment checked. If you cannot get that done then rotate the laser collimator while it is in the focuser tube and watch the projected beam to ensure that it is spinning in a tiny circle and not in a huge arc!
What suburb do you live in? You would be well advised to join an astronomy group and have someone with collimating experience guide you through the procedure.
Doug
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