Painting oneself into a corner and doubling down on your position, because that always works. Can't beat it for entertainment value, that's for sure.
Ok, so, you've got a real chance to change some minds here. Please share with us exactly what you did that made a Buck 110 fail, but then were able to accomplish with an Opinel 10. I'd like you to tell us all.
Because then I'm going to go do it with my Opinel 10, and one of my Buck 110s with a friend running camera, and we'll see how well your "actual experience" stands up to reality. You in?
Sure. Let me check if I have a spare #10 Inox kicking around and I'll send it to you. Just shoot me contact information in the VM.
Let's get on the same page on a few things though, as I feel like I've said the same thing over and over and it's somehow not gotten through.
First and most importantly, please don't test the lock strength of either knife. a) The Opinel's lock is not designed to withstand strong closing forces and will just pop off. b) Everybody knows this already and nobody is asserting that an Opinel has a strong lock, so you won't be proving anything. c) I don't want your mom yelling at me because I somehow goaded you into doing something stupid with an Opinel that resulted in you cutting off a few fingers.
Now, I'll do what you've asked and I will tell you "exactly" what I've done to cause Buck 110s and other lock backs to fail.
Hard cutting in wood, often with a twist to the blade. And I use them in wet sandy conditions regularly.
I maintain two properties (including my uncle's cabin) both of which get encroached on by trees and brush. I regularly bend cut back saplings and branches with my pocket knife because I'm too lazy to carry or fetch bigger tools. We all also camp regularly and make fires I the back yard regularly which entails making lots of shavings. It's not uncommon for me to get my blade stuck in the wood and to free it with a bit of a twist. Note, I don't consider this extremely brutal use but it's the I do that wrecks knives.
My uncle's cabin is on a sand beach and much of the camping we do is in sandy areas. And working on the property and in the garden exposes my knives to a lot of sand and dirt. One thing I look for in a working knife is the ability to continue working when dropped in the dirt and sand. When I drop a 110 in the sand, the joint gets fouled. I've had them fouled enough that the lock bar sits proud, which means I'm not getting full lock up which is dangerous. Because it's a friction folder, teh Opinel can be used safely with the lock ring entirely removed (they were sold this way for the first 50 years). This would be very easy to test. Bury both knives in the sand and see if they safely stay open. Just don't get hurt with a poorly locking up 110, as the blade can snap shut quickly.
I've got a knife roll full of lock backs. Mostly Bucks but a good number of Schrade US too. About 1/4 of them have vertical play that they've developed over the years from hard cutting. Once vertical play starts, I find it gets worse. And it's not something I can fix.
Some of my lock backs have developed horizontal play too. On the traditional ones, like the Buck 110/112 or the Schrade 6OT, horizontal play is easily and temporarily fixed by just gently squeezing in a padded vice. The plastic framed knives don't respond as well to this.
I would be interested in how you plan on testing the knives and capturing it video. IME, this kind of wear shows itself over the course of a year and it's better to just keep 2 knives handy and to use them side by each for year.
I can say this, it might be fast and sad to test for horizontal play by putting the blade in a vice and working the knife back and forth. On a classic Buck 110, I would expect this to pry open the front bolster in short order. On the Opinel, you'll snap the blade long before you'll get the joint to open up. In particular, I don't recommend this approach for adjusting the pivot tension on an Opinel. It doesn't make the joint less tight. I've busted 2 blades trying this. (A large flat head screw driver twisted in the edge of the collar is more effective.)
I have no idea how to quickly replicate the force generated by hard cutting in wood. Perhaps you could put the blade in a vice and wack the handle open with a rubber mallet? Again, I think using the knives hard for a few months or a year is a better approach.
Lastly, if you literally want to hammer on the knives, the Opinel 10 will stand up to light/moderate battoning, so long as you keep the lock ring disengaged. Just use the blade as a froe and use the freely pivoting handle to recenter the blade as needed. I did get one Opinel 10 to loosen up a bit by battoning hard with it. It developed a tiny by of vertical play, which was easily fixed by re-peeing the pivot pin. I would be sad to see you do this with a Buck 110 though as it would destroy the lock bar/blade faces and the soft brass pivot pin.
Just checked my stash... I don't have a spare #10 kicking around but I do have a spare #9 Inox I can send you. I wouldn't baton hard with the #9 but I do baton lightly with mine regularly.
Let me know and I'll send you the knife.