My friend showed me this istructable but he dosent have an account so ill put it on mine oh by the way this is soooo easy

Step 1: Get the stuff

you will need a toilet roll or a clingfilm roll or any sort of card board roll i used a kitchen roll roll.some scissors and some rubber bands i used four
.....but i do have an account! XD (to those reading this comment, I am the friend he mentions.)
at school we made a rock thrower that was simpler than this, you cover one end of a piece cardboard tube with tape/paper/something. drop a small rock down, hold it by the sealed end and swing. we have thrown a pebble about the size of your thumbnail about 30-50m

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