have you ever read the specs on O-ring sizes? I Beleve the groove hasta be BIGGER, not smaller, otherwize it wont squish down and fill the gap, itll overfill it. so Im just guessing, but I beleve your groove should be 3.5mm or around that, or at LEAST 3mm.
on my maze3 it has a .125inch oring, and a .155inch groove.
hope this helps ya out a little
Jon
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