I've got a character nicely rigged with the standard IK arm behavior, following the standard shoulder-stick-elbow-stick-dragable hand method. The rest of the head and body are controlled by the head with various sticks and pins to dampen the movement of the character to their waist and this works well.
When I drag the hand and leave (Hold in place) it holds but is still subject to movement from the head, torso and body albeit a small amount. Is there a concrete way to plant the hand rock solid?