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What's interesting about this lock is that because it's entirely asymmetrically lateralized -- that is, embedded in one half of the knife's frame, there's no problem with interfering with the center axis line.
If you look down the center of the knife, there's nothing but pivot and blade.
Which means you can get a flipper on the blade, and it doesn't need to pass through any kind of center-axis bar, such as the AXIS, Arc, or Ball-Bearing locks.
This is why we've never seen a flipper on any of those locks.
-j
SOG Vulcan. I have one, wonderful knife. It has both a flipper and an arc lock.
If the release button was about a half an inch forward (closer to the blade pivot) the knife would be perfect.