Hey Hiigy,
Shouldn't be too much of an issue to get it back together.. Sounds like your base ring got jammed onto the passthru battery threads huh? Just that I had a similar issue with the Plinth of my DCT getting jammed.. Also on a passthru batt? When I checked.. It appeared that the batteries threads were messed up. I assume by 'central spike' you're talking about the Atomser itself huh? Just that's the only 'spike' aspect on an Ego c? Unless I'm totally misunderstanding what you're saying? I probably am!

one of those things, where a picture definitely says a thousand words! Lol..

I would just set up as normal.. screw the base ring onto the battery not too tight, then sit the mini atomiser into the base ring, (in only needs to rest securely, not screwed in or pushed down hard) then screw on your cone over the top and away you go?
That's how I do mine anyway, I don't find the C Attie to be particularly fussy about its positioning?
Doubt that's helped much.. But thought I'd have a go anyway!

Cheers.