I previously reported on my BM 830 lockback failing the spine whack test 20 out of 20 times.
I since dissasembled the knife and here are my observations:
1. the lock was clean so was the whole knife.
2. the lock spring is a round bar which sits rather loosely in the spring pocket and which allows for forward and lateral movement. There is no "shoulder" on the locking bar which could stop the forward (blade end) movement of the spring.
3. I checked the following lockbacks for spring design , Spyderco, Outdoor Edge and Cols Steel - all have a flat or square bar leaf spring that sits against a shoulder on the locking bar to prevent forward movement.
4. After reassembly the knife survived the spine whack tests - one failure out of 15 tests.
My conclusion is that the reason for the failure lies in the spring design which most probabaly allows for the spring to move forward , resulting in lighter spring tension on the locking bar.
Does the new Ascent 820, 830 and 840 also have this round spring bar or have they been changed to a flat or square leaf spring.
I since dissasembled the knife and here are my observations:
1. the lock was clean so was the whole knife.
2. the lock spring is a round bar which sits rather loosely in the spring pocket and which allows for forward and lateral movement. There is no "shoulder" on the locking bar which could stop the forward (blade end) movement of the spring.
3. I checked the following lockbacks for spring design , Spyderco, Outdoor Edge and Cols Steel - all have a flat or square bar leaf spring that sits against a shoulder on the locking bar to prevent forward movement.
4. After reassembly the knife survived the spine whack tests - one failure out of 15 tests.
My conclusion is that the reason for the failure lies in the spring design which most probabaly allows for the spring to move forward , resulting in lighter spring tension on the locking bar.
Does the new Ascent 820, 830 and 840 also have this round spring bar or have they been changed to a flat or square leaf spring.