Now don't get me wrong, I'll talk good on Emersons til the cowsuit comes home. But...
I've owned four EKI knives and have seen others that belong to friends. When you first get an Emerson, the lock is "sticky" during its break in period. Lockup is perfect and all is well. After the break in, though, sometimes things will go downhill. My first EKI was a plainedge Mach 1. After two weeks of of occasional knifesturbation, I noticed that under hand pressure on the spine, the lock would start to slip. I immediatly called EKI and Mary told me to send it in. When it came back it was pristine. After the break in, the liner nested at 3/4 across the tang but the lockup was perfect. I still own it. Then I bought a Min Com and a waved 7 BTS. The Min Com was my BFC knife (to play with while BFC threads are loading on my $hitty 56k modem). After its break in period, I noticed that it soon started showing the symptoms that plagued my Mach 1 though nowhere near as severe. My fourth Emerson was a 2000 Commander SF, I got in a trade. After two days of thumbing and waving, the same thing started to happen. Another thing I noticed was that if you rub the tang of the closed knife on your pocket lip (vigorously), the lockup is good again.
Now, I've come to the conclusion that this happens to some "Commander frame knives". My waved 7 BTS is my user and it my look ugly, but it locks up tight every time with the liner meeting the tang a little over half way. When I say user, I mean every letter of the word.
Now don't nobody start flaming me about dissing Emersons because I really love them. I'm just sharing my bad experience with a few knives.