Your most difficult knife to learn how to open

The ZT 0550 by far was the most difficult to lear how to open . I had the palm of my hand pushing on the frame lock and I had to learn not to push the stud straight but go upwards with it and then it was so easy to open . But at the beginning my thumb was hurting a lot .
 
Boos Smoke. Love frontflippers, but I don't think that humanity as a species was supposed to move our fingers in that way.

I also very quickly gave up on trying to open my XM-18 with the studs.
 
The Real Steel 3001 in S35VN and marbled carbon fiber (Massrop knife) was a bit tricky to get the hang of:

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(The top knife is a Walter Wells custom in .044” M2 steel at 64 Rc with linen micarta. An incredible slicer!)

Back to the Real Steel: it is designed to not be one-hand openable to be compliant with some European countries' knife laws. The strong detent makes it impossible to open with just the thumb, but if you squeeze the fuller between the thumb and middle finger (thumb on the show side and middle finger around the lock side), you can pop the detent and then open it the rest of the way with your thumb. Once you get the hang of it it's quite easy.
 
This big front flipper.

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I don't even bother, though. It's got a nail nick.

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Now, this one.

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No nail nick. It's hell of smooth if I can get it to pop, but there's nothing natural about the way I need to hold it to avoid binding the lockbar.
 
I have never owned a balisong or front flipper and never will.

Of current and recent knives, the SAK. I've been spoiled by spyder holes, oval holes, thumbstuds, etc. As someone said earlier, nail nicks can be a pain in the butt.
 
Cold Steel Black Rock Hunter.
Love the knife, and it really is proof against any type of lock failure when opened, but I will NOT touch it if I have had any alcohol. Opening it with any type of speed is just not an option.

 
Lone wolf defender with a button type blade pivot squeeze lock. The button had to be squeezed to open and unlock the blade
 
Having to fight a knife to open (or close) never made any sense to me.
All my knives are either a slipjoint with a light to moderate pull, or a lockback.
I can honestly state that I've never needed a one hand opener/flipper or an auto/switchblade.
 
Crkt hissatsu folder. Damn thing was near impossible to open with the assist. There was a glaring design flaw. On some it was fixed and others not. Unassisted it opened very well.
 
I had some initial trouble with my Gavko Sixgill and Eustler DUK thumbstud openers. I found that I had to adjust my grip on both of them to avoid putting pressure on the lockbar. Once I learned how to hold them, it became a non issue. The Gavko was a bit more finicky than the DUK. Both of them ended up being great blades.
 
It took me a couple days to figure out thumb placement and how to roll it open on a arc, but I struggled with my Sebenza for a little bit. Haven’t had an issue with any other knives. The Sebenza is now a non issue.
 
Cold Steel Black Rock Hunter.
Love the knife, and it really is proof against any type of lock failure when opened, but I will NOT touch it if I have had any alcohol. Opening it with any type of speed is just not an option.

Oh goodness! Just watched this. Even with no booze I could see hurting myself. I've got a bull nose that I love dearly but it's a nail breaker. That black rock is like times 4.
 
Microtech UTX 70. I have the small California edition, and that spring is TOUGH to actuate with thumb alone with no leverage.
Are all MT double action OTFs like that? I had an Ultratech that was really tough to open, I assumed there was something wrong with it.
 
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