The new gate is in - and it is a fancy piece of gear, with a multi-lock mechanism in which any one lock can release the gate tang.
THE WRCS LOCK IS (NOW) THE SECOND FROM THE LEFT
To open/close sight through the upper slot.
Using both hand holes unlock and remove lock from the 2 steel plates, being careful to avoid any spiders that are resting in the housing...
....then, after recovering from any spider bites that you failed to avoid...
The handle is on the right side.
Push/pull so allowing a short movement of one of the steel plates to release the tang.
The gate should now open, but might need a slight lift.
IMPORTANT
When LOCKING make sure the lock hasp engages BOTH of the steel plates when the gate is closed