ThinkFun soda bottle connector

My entry to the ThinkFun challenge, this part allows you to connect your projects to a soda bottle.

I build this around the standard 28mm bottle cap compatible with most common soft drinks small, medium and large bottles.

You could fill a bottle with water or sand and use it as a weighted stand, you could use the smaller sized bottles as extra chunky - go anywhere wheels, or you could add bottles as floats or pontoons and make your projects amphibious!

I looked at several connection op