Good morning petters,
Sorry, I have not attempted such a thing; I doubt that I even have the necessary tools at my disposal suitable for the task. Let me remove the lens and have a quick look...BBS...I can tell you one thing by looking down tere -- it does not come out via the end anyway...I don't see any fasteners (scrws, metal collets, etc. down the battery tube either, so I am at a total loss as to how it comes out.