Thanks, that sounds much easier.
Quote:
Originally Posted by g__day
So you have created a craddle - using the block of wood and 4 nails - two at each end overlapping as a cross and you rest the collimator in the craddle and rotate it to check the beam doesn't move when you project it onto a dot on the wall?
More details = easier to give you help!
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That's exactly what I made, but I'm hoping to build something a bit more sophisticated if I find that it doesn't do the job.