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As far as I know, the V's don't need to be teribly accurate. It is the machining of the collimator which needs to be accurate. The V's could be totally out of alignment with eachother but a cilinder will still rotate on its own axis, which is all that is needed. As long as the collimator sits in the same possition each time it is put in the V's.
What is important is that the outside of the collimator is straight and true, and that the laser inside the housing is centred and pointing straight.
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