[dcnicholls]

Many of the laser collimators I've seen have beams that aren't circular, but quite elongated. While they're still usable for lining up a secondary mirror, a circular beam would be more aesthetically pleasing and a bit easier to line up in the ring on the primary mirror. I assume the oblong shape has to do with the laser emitter and the focussing lens(es) not being properly lined up.

Has anyone taken a laser diode unit to bits to line up the laser emitter and the lens? If you can dissolve the (green) glue used to lock the adjustment, is it easy to tweak?