Steve - there is another. Both DJVege and I have the AstroSydtem Barlowed Laser Collimator and would not be without it. There are a couple of threads on these, and after the hissing and spitting going back and forth I'm surprised no-one remembered them in answer to you question.
Simply brilliant - and a 2" machined barrel that is tight as a drum in your focuser. The laser is locked in place and is guaranteed not to go out of collimation itself.
Thread 1)
http://www.iceinspace.com.au/forum/s...t=astrosystems
Thread 2)
http://www.iceinspace.com.au/forum/s...t=astrosystems