Thanks Rowland, I'll hunt some down
The external end of my cold finger is slightly over sized so there is exposed copper, and I've had icebergs form on it!
I haven't considered the permanent fixing yet. It's currently held in place by a slot I cut in the case, and the tight bend of the cold finger on the outside of the case results in no wiggle. I'm considering an alternative, water proof case for v2
I'm pretty stoked that I've actually been able to collect some subs now though
I'll post a crop later. With an EXIF temp of 12C they decent enough for me to work with and reaching my target of combatting the warm summer nights.