No problem! I still would like to try that BD04 someday for a zoomie, (I included it in the list in my zoomie thread when I started it back in 2016).
In fact your suggestion has got me wondering something else: Is the BD04 battery tube removable? (threaded at both ends) or is it one piece at the top for the slider?
I’ve been toying around lately with making shorty zoomies by adapting 18350 tubes, so the BD04 would be a great candidate for one of my shorty zoom setups if the tube was removable and lego’d.
But I’m pretty sure it doesen’t looking a this cool disassembly gif:
