Word of WARNING.
I've been through the laser collimator collimation procedure, and the laser stopped working. It's easy to put too much pressure on the housing of the laser itself, which is just a keychain laser pointer. I don't know what's wrong with it. If I take it out, take the batteries out, tap it on the table, put batteries back in I can get it working sometimes. But when I try it in the collimator again, it eventually stops working again.
I ended up picking up another laser for $1.50 from one of the local junk shops. I managed to fit that in the housing and collimate it without breaking anything.
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