This is a spin-off from another 'ible which is currently under construction. I bought a green laser pointer and took apart the 'easy bits' which in this model was only the focusing lens of the collimator. (The collimator is a pair of lenses which align the laser light from the diode into a parallel beam.) I then had the problem of getting the focusing 'spot on' again, and came up with this method.
To do this, you will need a fairly advanced camera with a zoom function and 'manual' mode.
Also a dark place, a couple of tripods (or other way of holding camera and laser steady) and a piece of matt black paper. Do not try this if you cannot manually set the aperture and speed on the camera as it will not work.
Step 1: Warnings etc.
Laser light can damage your eyesight permanently.
Avoid looking directly into the beam, even if it's reflected.
I'm showing how I aligned my pointer.
If you try doing yours and break it I'm not going to buy you a new one.
Your laser pointer may already be 'spot on' and this procedure may be totally unnecessary.
A quick word on 'tweaks' :
There is information on the internet for various power mods to laser pointers and modules. Some involve 'burning' a component, or 'turning a screw' to increase the power output. These mods are very likely to kill your laser immediately, or if they do work, will drastically shorten the life. My advice is do not try them unless you are willing to waste the pointer.