Sorry to read your message, I always felt xtar wanted to be a part of BLF and thought they are.

I am not going to comment on exchanged PMs.

Here is my idea (just an idea) - ask whether a BLF friend in the UK would be willing to take a look at the light and potentially fix it for you. We are all friends on here in a niche hobby and we should all stick together and help each other.
If this is something you don’t want to do, then fixing it yourself might be something that could work out? We are here to help as well.