PhilX
Governor
I always think of the cornu as more of a phallic type of device of gross proportions, designed to enter easily but deeply. It having as well a symbolic function as a mock raping tool. What I was pondering above is more the triangular thing that doesn't penetrate like a monstrous penis but tears the lower part of the victim apart. Difference being that with a cornu the victim rides up & down on it mimicking the sex act. The Judas Cradle would be far less subtle.