Here's the basic steering system: http://2010.archive.hobiecat.com/suppor ... Manual.pdf
The 2011 Oasis should use the same system but with a couple of minor modifications.
1. Two "L" cranks in parallel rather than a single "T" crank. This accomplishes the same thing but with fewer space constraints, allowing a less constricted cockpit.
2. Continuous loop system using a cheek block rather than terminating at the crank. This takes the static tension off the forward crank, compensating for the increased friction of using two handles.
Here are a few pics showing the details:
Looking aft from the cheek block to the forward crank:
Detail of the forward rudder crank:
Close up of the crank showing both attachment points of the rudder line:
Hope that does it for you until Hobie gets their manual updated.