adding IK Spline Handle

In the previous rig i used the connections editor to link the rotation of the spine to a handle created with curves, so when the handle rotated the spine rotated. Not bad, but this method involves placing a curve along the joint chain, meaning more realistic fluid motion.

To add the IK Spline Handle, go Skeleton - IK Spline Handle and click at the root joint and then at the top shoulder joint, making sure the settings are the same as in the illustration (im sure they can be tailored to suit the situation, but for now i'm doing as the book says).

If you go into component mode you'll see 2 control vertexes that can be pushed and pulled around, but the spine doesn't stretch with it. That will be solved in the next step...