I do not presume to speak for Spyderco, but i doubt that they would do it for you. I called once about remounting the clip on a Police model to tip up carry, and the guy on the phone was actually speachless for almost 20 seconds, then told me that they could not in any way modify a knife to a configuration that it was not sold in. I pointed out to him that they sold the Endura II and Delica II drilled like that, he said yes but we don't sell the Police like that. Asked him about getting some traction grooves cut into the back of the hump and got the same answer and he added that if I had it done by someone else that it would void their warranty on the knife. I understand their perspective on this and don't intend this to seem like a Spyderco bash, just FYI. If you find out that they will, please let us know, I would love to send a couple back to get a few teeth but on them. You also might see if they would replace the blade, but that could be expensive.
I cut serrations on an Old Endura that I had when the 50/50 models came out (I was too broke at the time to just go buy a new knife). I used a set of chainsaw files to start the serrations, and then shaped them with a set of Spydero Profiles and finished them with a DMT fine diamond steel. I just cut a single step serration on it, and it cut just fine but not with the wicked hunger of the factory serrations.
I would recommend wrapping the handle and the rest of the blade with a couple of paper towels and then several layers of duck tape before you start. I would not use a dremel tool on any decent knife (let alone something of Spyderco quality) to grind the edge. Way too much potential for excessive heat altering the temper of the blade. Files are much slower and safer and allow you to work the teeth into just the right shape.
