Quoted from Jumping-Box:Experiment - Leveling the arrow inserts. Instead of applying heat directly to the insert, I made a hot plate and heated only the top of the insert. To my surprise, this worked great.
Using hard hood, I cut and sanded a block of wood to match the inside of the 1.5 inch arrow insert. The wood fit snugly into the insert.
Good idea! Thanks for posting this, Most of my firepower inserts need to be straightened.