Answer:
I must be broken before you can use me.
I have three eyes and only one leg. Obey me or you will be sorry.
I am the same written forward backward and upside down.
I'm as simple as a circle worthless as a leader; but when I follow a group their strength increases tenfold. By myself I'm practically nothing.
I am a nut with a hole
What is lighter than what it is made of?