So I have some old K2 Enemy's that has a core shot roughly 2 inches long on the edge near the waist of the ski. I'm planning on selling them to a friend for dirt cheap, and I want them to be in decent condition. It's gonna be his first pair of skis. I have tried to ptex it but after a day on them it just cracks a falls out. One of my friends said to put a screw into it and grind off the tip, then ptex it. Is there any other methods to tackle this?