Sebenza 25 Question

It probably needs a combination of cleaning and break-in. Modern firearms require the same to be reliable as tolerances are tight out of the box and most companies pack them full of grease to protect. Taking it apart for a full clean & lube is generally the first thing I do with either gun or knife and it's easily accomplished with the Sebbies.
 
Probably junk I'll take it.

I love my first 25 (bought new). It was similar in action to what you describe. Just needs a bit of break in. The design of the detent is quite different. It's pressed in the end of the lock bar then crimped in. It's large 1/8" ball which will have 2x the surface area rubbing as its opened. Also 2x the mass sitting in the detent hole. CRK makes it very clear these are not to be "Flicked" open. That aside we all do. One thing I try and helped with my 25 was take a tiny bit of Tuff Glide and put it where the detent rides. I then push on the lockbar to add opening pressure and give it 20 or so cycles. It seems to wear in nicely. Sebenza's seen to get better with use. They manufacture with very tight tolerances. Just be patient and enjoy it. Too much fluorinated grease has a hydrolic effect as said above also. The detent hole will start to develop a nice little ramp with time as the ball (ceramic) is much harder than the steel.
 
On my 25s, when new, I use the tip of my finger to flick out the blade a bit. The blade will not fully open, just get it off the detent and out about 1/3 - 1/2 way. Then I push against the thumb stud again and open the blade fully like normal.

Once the ceramic ball wears a ramp into and out of the detent hole and the "track" it will ride in/on the blade, it will get easier.

I have always opened 25s that way, almost two years later, and even a medium-forceful flick of the thumb tip against the stud will not fling the blade fully open and slam against the stop pin. It, sometimes, will open all the way and barely click into place. But typically it just gets it out there so I can open it up without any thumb tip pain, and it works like a charm.

With their excellent tolerances, it is a struggle at first but it will get better as things seat, the ramp wears and the lube gets spread around/thins out a bit.

But it is well worth it. I have many knives that open easier, but the 25 design is so stout when open that I have forgotten how they can be a pain at first to open. I simply don't care, as it is a most excellent knife.

I currently have three of them, two with micarta inlays (one left-handed and one right-handed) and a standard handled one, which was my first CRK ever. It will easily last you until they put you into the ground, so hang in there and you'll soon see what we have come to love about these knives as well.
 
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