I just received my new Leatherman P4 Squirt. I'll be adding it to my BK10 sheath pouch. It looks to be real handy. But I'm somewhat blade-ignorant. It appears that the blade has an edge on one side only. Is this by design? I'm worried that if I add an edge to the other side I will be making an already fragile edge even more so. So I'm thinking I may just sharpen up the one side only. What did you guys do, if anything?