There's plenty of space inside the grenade and under the clamp if you use roman's cage between the grenade and the booster. I've made my crystal chamber to fill the whole grenade though, so I can't use a 18650 battery unless I rework the chamber to be about 1cm shorter. But first I'll try with one of those smaller batteries (forgot what's their type, but they are also 3.7v)Holy smokes! That is just gorgeous. Your grenade is PRISTINE, looks so good. There's a bunch in here I'd love to ask you about, if you'll permit some Obi-ANH newbie questions. First, how on earth can you fit an FX install in one of these?!? Is the blade just sitting in the BP with no retention mechanism?
Also, regarding windvanes - does anyone do anything to secure them in place, or prevent the ring from sliding off the turbine section? Or are those just always floating too?
As for the blade it is held in place with ring magnets and a little bit of press-fit into the BP. That is secure enough for the way I intend to use it.
Feel free to PM for details on the fx install.