[digger48]

I learned what not to do by my older brother and his friends.

homemade cannons, crossbows made from leaf springs and axles...

[factoryrat]

I made a leaf spring crossbow once. It was designed to launch a 4 foot straight steel pry bar. It was “fired” exactly once, at a 45 degree angle.

A word of advice: paint your projectile with a high visibility color paint.

We never found the pry bar.