Making a "Fake Star" for Optics Testing

I am looking for suggestions on how to create a "Fake Star" that I can use
for indoor - daytime - optics testing. I have tried a laser pointer on a
wall but I cant seem to get the point to resolve to a clean "Star Like"
image in my scope.

I am sure this has been done - and I have even found one company that sells
such a device with little explanation as to its construction or use on the
site:
http://www.sunflower.com/%7Eclafever...ml/ezstar.html

It looks like some kind of a light box that fits over the end of a scope?

Any ideas on how to construct something that would be useful for testing
optics?

As always - thanks in advance!!

~derek