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By the way - one error in Andy's video. Every photo of the primary mirror tilt shows him with his fingers on one of the "lock" screws, rather than the larger collimation adjustment screws. Don't get confused. Also loosen off the lock screws a few turns. If the mirror support springs have enough grunt, you can leave the lock screws loose for your viewing session, just nip them up when you are finished and want to pack up or move the scope.
There are two worthwhile checks when you have the laser in and everything aligned. Rack the focusser all the way in and out and watch what happens to the laser spots (on primary mirror surface and on 45 deg surface in collimator). Hopefully they don't move too much. Also move the scope in altitude from zero degrees (horizon) to 90 degrees (zenith). Again, do the spots move much - hopefully not.
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