So my brand new ritter mini grip doesn't have much of a point on it for some reason (I bought two of them, the other one is fine) and I've been filing the back a little bit to restore it. As far as I know sharpening the back of the tip is really the only way to get it pointy again, excluding simply sharpening the edge for a very long time. I've only got one folder that has seen a whole lot of use, as I have several and often rotate. How long can a knife take this sharpening on the spine before it becomes a problem? Obviously, the more it is done the weaker the tip becomes. Any tips for easy ways to restore it and how to maintain it?