These are large flashlights that can be easily converted to a laser housing, and they are very popular with the guys over at LaserPointerForums. I am just posting this because this guy is accepting great deals on multiple quantities of these lights right now!
I’ve been told and also read about simply taking some 1.5″ aluminum bar stock; drilling 12mm hole in it, and putting it into these flashlight heads for the heatsinking. No milling or lathe required! You will still have to modify the circuit and use it as a contact board, leading to the driver of choice for whatever diode you are using. I will provide more info later as I perform this build myself.