Special knife tool??

I noticed that a lot of Chinese knives have an unusual opener tension button. Most of my knives just have a star screw there, what is that 3-holed thing and how can you adjust it?

I use a fine-tipped needle nosed plier in two of the holes .

I had to adjust my Enlan EL01a so I could snap it open with the flipper .

You can get a trident bit from a screwdriver security set, or use a watch case opener (ladies' size)

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jacktheclipper adjusted his flipper, with a plier in two of the holes...

Now his knife put strife in his life, as it sheared off the end of his pole !

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I made and used this today. It wasnt easy to use, but it worked.