If somebody wants to see how servo motor works here's the animation which explains it in easy-to-understand way.

How servo motor works (4 min 4 sec)

I've made this movie about 10 years ago, then I forgot about it and today I was looking for something in the internet and I landed on this forum. Because movie is still actual I would like to share with you. I hope this animation will be helpful for someone.

Cheers,
BS