Step #1: Start from matched grip.
Step #2: Move the middle, ring, and pinky fingers underneath the stick, while keeping the fulcrum between the index finger and the thumb.
Step #3: Push the stick with your middle finger so that it rotates backwards toward you.
Step #4: When the stick falls downward, bring the ring finger underneath to lock it in place.
Step #5: Pull the index finger around and over the stick to allow the stick to fall into traditional grip.
Technique Tip: This is not a continuous twirl. A lot of drummers do it with the left hand since that’s where they’re likeliest to go back and forth between matched and traditional.