Just received the 18mm adapter direct from Tinymight and big disappointment : it won't fit in. It's bigger than the metal ring tightening the o-ring. Could use the adapter without it though, but don't think it's normal... Will have to contact the maker.
Have emailed the maker :
Hello,
just received the 18mm adapter I've ordered you for my Tinymight. But it won't fit in. The adapter is slightly larger than the metal ring tightening the silicon o-ring, so I just can't pass it through. It's a micron size affair, but it's unusable nonetheless.
Have you got a solution for me ?
Kind Regards,
Now waiting for en answer, will see what he's got for me.