The OP was likely looking for my input, as I had posted in the "best lockup on a folder" thread about a technique I once used to modify the spring tension on a triad lock knife. I disassembled the knife, placed the spring in a vise, and, yup, tapped it really lightly with a hammer a few times and reassembled the knife and tested the lock action. I did this a few times until the action was where I wanted it. The knife suffered no functionality problems thereafter.
I did not come up with this idea, mind you. I had read it previously. Since then, I have also bent the spring on another triad lock knife with pliers, which I find to be a quicker and perhaps more precise method. Some triad locks I have owned have even received grinder treatment to change the lock geometry. Those also fared well, and were perfectly functional and strong knives. These are not difficult mods to perform, and unless one has no concept of patience or restraint, then there is no reason it should lead to a damaged knife.
Full disclosure: I have degraded the function on exactly one knife out of all the knives I have modified. It was a Voyager XL Tanto turned wharnfoot or sheepscliffe, as it were. It's the one with the opening hole instead of the thumbstud. The only reason I messed it up is because I tried to make G10 scales for it by hand, something I had never done before, and my precision with the holes was just not where it needed to be. The knife was able to be assembled, but the fit just didn't allow a full lock cycle. I tried to grind somewhat in the stop pin groove on the tang, in order to get it to function, which it did, but I had sloppy blade play which rendered the knife absurd. I ditched the project, and reassembled it with the factory scales (which I had also modded), and it functioned, but with some noticeable blade play. I alleviated this by applying some CA glue into the stop pin groove in the tang, which resulted in solid lock up for a time, but it has degraded with many lock cycles, and there is now some noticeable blade play again. It is enough to be an annoyance, but not enough to compromise the knife. It's still a decent knife, but it'll never be great. Now I know why so many scale makers refuse to make scales for Recon 1s, Voyagers, Enduras, Delicas, etc.
And OP, why are you planning on being attacked? With situational awareness and a good attitude (humility), you should never be attacked.