Someone said to wrap some fine sandpaper around a piece of dowelling and increase the "bore" (do I sound as though I know what I'm talking about? Quite right, I don't)
Scylla, thanks for pointing that out. No way should anyone do this. If you note, when your atomiser is in place its a tight fit, in some cases too tight, we know this, hence Im using a Titanium one now. The fact that this one pushes and then screws easily is because we are putting a shiney surface against a shiney surface, BUT, the result of this is that the atomiser will wobble slightly in the casing.
The atomiser is meant to fit snuggly. And the Janty original black one, did just that, so it was perfect, however, the matt finish stopped it being easily removed and replaced for cleaning.
So no sanding is needed, by doing that warantees are out the window.
Cellmeister is correct...
once in position, the atomiser screws in very gently in order to lock it in position.