How do I bring a contraption from singleplayer to multiplayer?

I made a contraption in a singleplayer game that I would like to share with my friends. What would be the best way to do this?

Advance Duplicator.

It comes with Wiremod :3

This, also, make sure you go to the settings on adv dupe and click upload/download menu, and click your dupe and upload it, your done.

Note: Not every server has Adv dupe :v: