Method 2
At the left are a couple Laser Collimators hand machined by Howie Glatter. The larger one on the left is the 2" - 1¼" Green model that produces a laser beam with 5 milliwatts of power at a wavelength of 532 nanometers. This device can be used to point out stars and constellations outdoors in the night sky, as well as collimating optical instruments. Its bright Green beam is visible even in bright daylight.
Attach one of Mr. Glatter's Holographic Adaptors and you have one very powerful highly acurate collimating instrument that is very rugged as well.  Exercise great care when working with this device not to shine it directly into anyones eyes, including your own. You can look at its impact on a mirrored surface as long as the beam is not directed towards your eye.