How to Make the Firing Pin

Making the firing pin is easy.

Cut a 3 inch piece of dowel and drill a hole in one end about an inch from the end.  The hole will be for the string to thread thru so it needs to be small enough not to break the dowel but big enough to fit your string.

Next you will need some eye hooks.  The size of the eye should be big enough to fit the dowel.  

The eye hooks will attach to the trebuchet like this.  

Now you will need to fashion the sling to take the pin. Start with about 5 inches of tape and split down the center leaving two strips.

Trim about an inch off one side so it is shorter than the other

Place the shorter side on the longer side with sticky sides facing each other leaving a sticky part at each end.

 Now stick this strip loosely to the sling as shown.  I used my dowel to keep the space

You will need two more short strips - maybe 3-4 inches

This strip will wrap around the sling as shown.  You can wrap twice for more security but I haven't had one break yet.

Do the same below the loop

The pin fits like this

When its hooked up this is what you will have

 Fire in the hole!