Just some WISMEC Presa TC75W news: According to Rip Tripper's review, there is no step-down for those that wish to run it in wattage mod
As a tootle puffer...who's been "watching" the WISMEC Presa TC75W...that's somewhat disappointing.
Guess I was mislead by its product page...that specifically notes "Output Wattage: 1-75W"...

Presa TC75W - Wismec Electronics Co.,Ltd
the Kbox mini doesn't have a spring loaded center pin. Kanger opted for a nice sealed - a bit 'spongy' but not spring loaded. The 'feedback' made them rethink (I think) and according to Phil and to me - Wayne at heaven gifts - the next version will be spring loaded
I, too, have been waiting for the KBOX Mini with a spring-loaded pin (and for the availability of buying the mod without the tank).
Ran across this KBOX Mini Platinum...that is 60W, has TC...and does have a "Spring loaded 510".
It does appear to look like the KBOX Mini. (Unfortunately...I have yet to find its dimensions.)
Code 5%downforyou makes it $47.49...
Kanger KBOX Mini Platinum 60W TC VW Box Mod Silver Authentic
I did the same thing ONCE! What a mess. 