I used to use a small tube cutter, but if you don't tighten it in very small increments, it pinches the aluminum down a fraction. Then if you ream out the end of the shaft with a knife or other object it creates a small angled ramp on the inside shoulder of the shaft wall, which encourages the insert to be jammed up into the end of the shaft if the arrow hits something solid. I had several arrows get wrecked that way, then someone here on TG made a comment about that very issue, and explained the root cause. I switched to using my Dremel jig, and the problem was resolved. I assume it's because the Dremel leaves a 90° shoulder on the shaft for the insert to rest up against. No more tube cutter.