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This propeller keychain consists out of two pieces. The case and the propeller itself. You obviously need one of both pieces to make the keychain.

The propeller has one side that sticks out. That side has to be mounted to the bottom of the case. So, towards the side that connects the inside with the outside. A little lube will make the propeller turn a lot smoother.

Also check out and like our new Turbine keychain:
http://www.thingiverse.com/thing:510851