liner lock failure

Is the "spine-whack test" relevant?
I can only tell you what happened to me:

I have several liner-lock knives and I have never felt the need to whack them on the spine. I felt that they were perfectly safe and I carried and used them without fear...until I cut myself.

One day I was carrying my CRKT Gray Ghost Mirage (a Hammond design and one very comfortable and stout knife).
That day I happened to have some mud on my shoes from working around the yard. The mud on my shoes had dried and left clumps around the shoe's edges.
So I sat down and pulled out my trusty Mirage and scraped the mud from my shoes with the back of the blade. This was no problem but I still had mud in the tread of my shoes.
So I tapped the bottom of my shoe with the back of the blade to loosen the mud and SNAP, the blade folded on my hand and cut the first knuckle of my fist.
I was stunned! I could'nt believe how easy my rock-solid locked knife had closed.
After getting a bandaid for the small cut I tested the knife again--maybe it just was'nt completely locked?
So, another light tap and it closed again. And it did'nt take much force at all.
I had certainly learned a lesson, and the small 1/2" scar on my knuckle reminds me to always test the lock.
It freaked me out so much that I tested every knife I own (my liner-locks, my lock-backs, my axis-locks, my Meerkat phantom lock, my CRKT Bladelock, and my Vesuvius compression-lock).

All the other locks all held firm.
The CRKT Gray Ghost Mirage was the only one that failed.
Maybe it was just a problem with this one knife, but I'll always test my knives from now on.

BTW, The liner-locks that passed are:

Gerber Harsey Air Ranger
CRKT M-16
Kershaw/Onion Scallion

Good luck,
Allen.
 
The "Spine Whack" test is more than relevant! I worked at Blade Art for more than three years and I did this religeously! The one time I did not I almost lost my trigger finger!

It was with a large Steve Ryan clone (not an original). The liner lock snaped over VERY athoritatively, sounded very solid. On most Ryans the problem is closing them as his locks are very tight. With this in the back of mind, I tried to cut a corner off a box lid.

Centrifugal force shut the blade (or tried to!) on my trigger finger (RH), right on the serrations no less! Six stitches on one finger. The doctor said I was lucky I didn't lose it.

So yes, EVERYTHING got spine whacked after that, I don't care who made it, and yes, I sent many back to be reworked. Some by some very big names.

Much better safe than sorry!
 
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