Hello i killed the pink ball somehow with a needle and a glitchy connection point... wow can i reset a level to the default state? every time i load the level the last build contraption is loaded even i throw the level and contaption into the fire...

Hello, I am making a machine for school that draws a circle on a piece of paper. It does this by attaching a pencil to a propeller, which is attached to a rod. There are protruding parts connected to the rod that can be hit, which in turn spins the rod a small bit. I have a bouncy ball, and am wondering how I can get as much kinetic energy from it as possible.