Hi Ernio,
Its a good question, and the answer is there is hardly any resistance if your moving the plastic arm that you see with the ball or (socket) on the end when its disconnected from the link/stepper motor, as all you are doing is rotating the swirl flaps (see the attached info for a lot more technical info), hopefully you wont need to replace the internal plastic 'throttle/flap' part, for most people making a repair to ensure the link doesnt drop off along with a 'stop' to reduce the amount of stress on the linkage will ensure a good fix, i did mine at least 5 years ago and its still working fine
