Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:1660813.

Because I lost the hand crank for my BBQ fan I made a replacement part.

It can also be used in all cases where a crank with a 6x6mm² four cornered shaft is needed.

Edit 19.11.2016: Added an arm model with 5x6mm² pin on request of usernameisalreadytaken.