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Here's another one!
Mine came with it's own collimator which is basically 2 wooden V-groves on a platform with a rubber band to hold the collimator on place..After outlining the beam on the wall about 4 metres away..rotate the collimator 180 degrees and outline the beam again..measure the distance beteewn the two and mark the middle..after each adjustment rotate the collimator 180 degrees to check the adjustment until it's centred.
Cheers!
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