Some people have been asking for details on the making of the operational drawbridge and portcullis of the Falcon Depot. So, as I tore it down, I documented their inner-workings. The drawbridge pivots at the base and is wenched to its upright position with a chain that is anchored on one side and wound around a bar on the other.
The portcullis is actually modeled after historical drawings of how real portcullises operated. A chain on each top side of the portcullis is drawn around a pully and centered and wrapped around the bar turned by the crank. On both cranks (portcullis and drawbridge) there is a stop mechanism to prevent the crank from reversing itself during turning. This allows the poor soul doing the cranking to only have to fight gravity for little bits at a time.