On August 29th, 2018 Santa Clara County Park's (CA) Natural Resource Coordinator Kyle and I installed a pulley system on a Barn Owl nest box mounted on a 2" diameter metal pipe. The system enables the raising and lowering of similarly mounted large nest boxes from the ground thereby negating the need to lug a ladder to the nest box in order to access it. A lock is used to secure the box in its raised position.
Although a Barn owl nest box is shown, the system will work with a similarly mounted kestel nest box.
Videos of Kyle using the pulley system to single-handedly lower and raise a pole mounted Barn Owl nest box are at:
The attached photos provide some insight into the make-up of the system.
San Jose, CA