Minor lock rock?

D

dkblade

Joined
Nov 7, 2014
Messages
880
My large 21 started life as an insingo. I carried it as such for a year then sent it back to CRK to have a regular blade fitted. I got it back from CRK, beautifully adorned with all silver hardware and double silver lugs. I carried if as such for a couple weeks before one day noticing that the knife in the open position was exhibiting a little bit of lock rock. With medium pressure I can get it to move ever so slightly up and down. I can't tell if it's just the lock bar flexing or not. I can make it move at times with my thumb pressing on the jimping.

I know everyone's answer will be to send it back to CRK, but I want to know if anyone else has noticed this and if it may work itself out after being used for a period of time? Thanks!


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I have not noticed it with any of my CRK's. My assumption would be the lockbar / tang relationship was altered a bit when switching from one blade to another, though I can't say for sure.

As predicted, I recommend you send it back to CRK. No doubt they'll be able to fix it. :thumbup:
 
Never have experienced any rock lock with a CRK.
Don't have a clue if it will settle in. Have you tried to rotate the stop pin to see if it has a flat spot ?
 
Ajack60 said:
Never have experienced any rock lock with a CRK.
Don't have a clue if it will settle in. Have you tried to rotate the stop pin to see if it has a flat spot ?
Click to expand...

I have taken it apart 2 times since I got it back but I haven't purposely tried to rotate it but I doubt it would have been put back together exactly the way it was before.

They did say the lock bar was "broken" and had to be re-heat-treated when I sent it in. I just hate being without it for 8 weeks. And the last 2 times I sent it in it was for the whole 8 weeks!

I did make it a point to tell them I wanted a perfectly centered blade (which it was) but maybe they did something to make sure it was perfectly centered as a priority and in doing so created a little lock rock? Maybe I'm just grasping at straws.


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This may not be the answer, but the 1st thing I would address is possible lint or other build up on the lockbar face or tang. Clean the tang with alcohol and slide a piece of paper between the lockbar face.
If that doesn't work-on to the next idea
 
What is your lockup percentage? If it is early, perhaps the lockbar is out of adjustment.

FWIW - I've noticed side to side play in mine and found the cause to be a loose pivot screw.
 
I have never had this problem other than the dirty tang as previously mentioned, but since this is a new to this knife blade it is possible the lockup has not as yet fully set(found it's set position). I am basing this on other knives, but sometimes there is a break in( wear in ) period before a lockup finds it's solid position. You may just need to give it a little time and use.
It also could be lockbar tension-requiring a trip back to the mother ship.
Of course if you send it back to them they will take care of the problem regardless of the cause-so that option is always open if you don't come up with an answer yourself.
 
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I currently have the same lock rock when a little pressure is applied. It feels like the lock is moving back and forth when applying the pressure. Most 21 owners don't have this issue. It doesn't bother me that much, as it wont slip while im cutting, but I do plan on sending it in to be looked at. I bought the 21 to last me a lifetime.
 
I have several daily user Sebenzas. I have never experienced any lock-rock on any of them. I'd say this is very abnormal.
 
Could be lock bar tension, or lack there of? You can check this by removing just the blade, the lock bar should touch or come very close to the other scale, if it doesn't this can be a cause for lock rock. You could then try bending the lock bar slightly to increase tension.
 
Jimbo75 said:
Could be lock bar tension, or lack there of? You can check this by removing just the blade, the lock bar should touch or come very close to the other scale, if it doesn't this can be a cause for lock rock. You could then try bending the lock bar slightly to increase tension.
Click to expand...
I am fearful just reading this...
 
Jimbo75 said:
Could be lock bar tension, or lack there of? You can check this by removing just the blade, the lock bar should touch or come very close to the other scale, if it doesn't this can be a cause for lock rock. You could then try bending the lock bar slightly to increase tension.
Click to expand...

I think I will try removing just the blade and see how close it gets. I'm not sure I feel comfortable bending the lock bar more if it needs it though!


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How does this look?
6d72af6d6563ca447a13d4973b39b530.jpg



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Do you see a light groove/mark on the blade tang where the lock bar and blade mate? It's already been asked, what's the percentage of lock up ?
If its early, it just may need some time to settle in some more. I've got one with early lock up, I'd guess around 20%, but it's solid.
I've always taken the knife completely apart, the lock bar should travel beyond the slab. I can't tell if the pic shows enough tension on the lock bar even though it's hitting the opposite slab.
Even though the issue may be as simple as lock bar tension, I don't know if I'd try it on a CRK. I've adjusted the lock bar tension on two other knives that weren't CRK's. If you bend it too much, you will create lock stick.
If you can live with it, use it a while to see if the lock bar will settle in and see if that resolves the lock rock.
 
If you don't feel comfortable bending the lock bar, you shouldn't do it. Sending it away would be the better solution for you. If you are anxious to get this solved send it to CRK, but I would give it a little time to settle in and see if the trip could be avoided, but it is your call.
 
dkblade said:
How does this look?
Click to expand...

Looks just fine, at least from the pic it doesn't appear that lock bar tension would be an obvious issue. I have a couple that would fall short of the opposite scale but still have rock solid lock up. Did you happen to notice if there was any deformation in the lock face before the blade change?
 
Jimbo75 said:
Looks just fine, at least from the pic it doesn't appear that lock bar tension would be an obvious issue. I have a couple that would fall short of the opposite scale but still have rock solid lock up. Did you happen to notice if there was any deformation in the lock face before the blade change?
Click to expand...

Good question, there was an indentation in the lock bar at the edge where the blade tang travels over to drop the lock bar into place. It no longer exists where it was when I sent the knife in, but there is a visual remnant of it which could signify the smallest of bumps from being re heat treated. I'll try and get a pic tomorrow! I think I'll give it a few solid months and if it doesn't go away I'll ship it back in.


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Just a heads up, I boxed my precious Seb up and sent it to Idaho yesterday to eliminate this lock rock situation for good. The fine folks at CRK said they would compensate me for shipping, expedite it, and pay for return shipping since it left the facility with the lock rock. Not gonna find a company quite like it anywhere else [emoji16] can't wait to get my knife back ad perfection soon!


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