Take a small piece of sandpaper, roll it up so it goes into the field point. Run it in there, turn it a few times and scuff the inside. Then take a Q-tip soaked in a little bit of mineral spirits or thinner and clean out the inside. This removes the sandpaper grit and any oil residue from the manufacturing process. Once dry (only takes a minute or two), use some hot melt glue (I like Bohning's stuff) and glue the points on. I very, very, very rarely have a point come off using this process.