I was curious about and recenty acquired a Spyderco P'kal. It's my understanding that the small steel rod that's described as the "wave feature" is removable. I think it unscrews, but I haven't been able to turn it. I don't want to 'bugger up" the small rod by using pliers, but I'm not sure how else to remove it. I've tried using a variety of synthetic "grabbers" and clamps, but nothing I have holds tight enough. Any ideas?