I love the car analogy...! The Sebenza is the Rover...refined yet sturdy!
To be clear, my blade is as smooth as silk. When I pull back on the lock bar, the blade moves freely, almost like it is on ball bearings!
The issue is with the friction of the lick bar against the side of the blade pivot, like others mentioned...
One of the benefits also is a weakness...
The lock is wonderful on the sebbie and like others have said, 'SNAPS' into place when the blade opens fully. Of course, to get the 'snap' there must be pressure exerted by the lock bar to the blade pivot. Once the pivot clears, the lock bar snaps into place. Well, it is this pressure that caused the friction, not the pivot. I did use pencil lead to smooth it out a bit, but the pressure is still cause resistance.
BUT, I have to mention another cool piece of engineering. The actual pressure point of the lock bar to the pivot actually a tiny little nub. The folks at CRK identified the problem described above and mitigated the effects of the frictions by reducing the surface area of the pressure point. Pretty coo....but it also confirms my concern that one of the benefits is also a weakness...But, the benefit of a strong lock outweigh the benefits of a friction free glide...
More musing...
I hope the above makes sense...