pt 1.http://www.youtube.com/watch?v=XgKLrVBn2O8
pt 2.http://www.youtube.com/watch?v=pQ7OmoyATgU
pt 3.http://www.youtube.com/watch?v=pQ7OmoyATgU
Have a look at these, you will see that the Pro motor is nice to work on. With a little of your engineering skills it should be fairly straightforward.