Sorry about the back-to-back posts here, but they are really not very closely related.
I played with my Blu-Ray from Lasershopuk a bit today. I figured I had better now, so why not look a bit closer. If you read reply #6 above you know that I have one like the 20mW pictured above. Mine is only rated <5mW, but the construction and power source is the same. I stated in my reply above that the biggest problem I had with the laser was that it was not focused very well.
The cap screws off easily from the unit. Under the cap was a brass tube with the lens at the bottom. The tube is about 7mmOD and a little over 5mmID. The whole thing was "glued" into the barrel with a white silicone like substance. I decided to dig the silicone out to get the electronics out. After I dug out most of the silicone, I tried to pull the unit out. It didn't come so I tried to gently pull it out with a pair of pliers. As I pulled I noticed a bit of "play" in the tube. As I turned it, it appeared that it was only the tube turning rather than the whole unit. I decided to take a chance and twist it.
As I twisted it I realized that the tube was the only part moving. I got braver an just started turning it. It unscrewed. The part that came out holds the lens in the bottom. It is about 15mm overall and the tube part (that stuck out) is about 9mm long. The end result here is that my Lasershopuk Blu-Ray is focusable
It is now focused nicely at about 30', which is about what I need in lecture. I do not yet have a way to measure the output, but it is much more functional now.
BTW Milos, I don't know what this module is, but the extra lens that you sent me screws right into the opening of this pen. It is sub-surface before it is focused, but it fits and works in the unit as well.
Also, it is still on its first set of batteries and while I was playing with it this time, I extended the duty cycle to about four minutes