I saw this great Aluminum Dart How-To at Thud’s Cave.
These instructions are good for anyone wanting to make an aluminum dart out of aluminum arrows. However, the dart made will be short. To make a longer dart, the reader merely needs to use the same instructions and add a third half section of aluminum arrow shaft to make a 6 or even 7 foot long dart, which would be better for an adult. The darts made following the instructions as written would be a good length for school age children ages 6 to 13.