Ordered some 16x1. Hopefully that fixes my problem. It's just mind boggling especially since I got it to work before just by changing the stock top mouthpiece o ring to some new 9x2. Mind you, I got it to work after many different builds without any leaks even with the mouthpiece almost completely open before. Now, I can only open it half a turn or less or else juice slowly leaks out from the center pin hole.
Btw, I'm using 3mm silica doubled up at top.
There may have been some confusion here as the poster was asking about Hecules, here are the sizes for both Hercules and Terminator
Terminator tank o-rings are 16 x 1.5 mm and mouthpiece is 9 x 2 mm
Hercules tank o-rings are 16 x 1 mm ( 17 x 1 mm if 16 x 1 mm still leaks ) and mouthpiece is 9 x 2.5
From here: http://ggwiki.et.com.mx/index.php/O-Rings#Odysseus_short_mode_.28new_rebuildable_style.29
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