I made the trebuchet prior to this tutorial.
Here i will show you how to add functioning wheels to your trebuchet.
Step 1: Cut Out Your Wheels and Glue on Your Axel Holders.
Cut out your wheels with a circular bit to have a wheel with a hole already in it for your axel. Next, if your axel doesnt fit then use a same size drill bit to drill a hole for your axel. Then, Glue on your axel holders which i bent some steeples to make those.
Step 2: Axel Installation
Now when your glue dries put your axel, with one wheel on it, throgh the axel holders and carefully put your wheel on it. And now you should be done