I am relatively new to hockey and have been sharpening my kid's skates (and her teammates) for about a year. I have had very good results and feedback. But yesterday I got a pair of CCMs and I noticed that I was having trouble sharpening them. I took a close look at the runners and the thickness of the runners tapers from the usual .115" near the plastic holder to .100" or so at the edge that contacts the ice. You can actually see the falloff of the thickness of the metal as it nears the ice contact edge by holding a starrett straight edge to the face of the runner. I have not seen this on any other runners. The dad who gave me the skates said the CCM runners were brand new. So my question is whether this is an intentional part of the design or a manufacturing defect or something that happened on first sharpening when they were purchased? Any help or advice would be greatly appreciated.