Michael,

I think sprink is talking about the torque at the surface not at the servo. The servo torque is constant for a constant voltage. The torque at the surface varies as the length of the control horn is changed. In this case he moved the control horn to half the original distance to get back to full surface throw. This will cut the torque at the surface in half. The equation is

T = Fd

In this case the force delivered by servo the the push rod is the same. But you have changed the distance of the control horn to half the original value, so torque is also cut in half.

Tracy Hill