We wired up the arm servos and motor and practiced enough with it to make some final adjustments in sting tension and tightness. Everything seems to work fine. We can stack stones ten high.
We afterwards removed the rotating servo from the stone clamp since we are not planning on using it. This reduces weight on the clamp since we only have the clamping servo on the clamp. This gives us one less thing that may break or otherwise cause issues. We like simplicity and reliability, if we can get it