Advanced Vending Machine

Most vending machines in Minecraft have a problem where putting the wrong amount of items in can result in you losing them. To fix this issue, I created a simple mechanism, which you can customize, to make vending machines and trading in Minecraft easier. The huge vending machine is basically for show - the video is meant for the mechanism, but what the heck...

(http://www.youtube.com/watch?v=TpgWOtN2QFs)