Go to this
site and it tells you how to do it (scroll down the page a bit to find instructions). I just ran into a similar problem, and this actually does work after you try it a couple of times. Be VERY careful while doing this though so you do not damage the encoder board. It seems to me that the bracket hole to mount the encoder board to are a bit narrower then they should be, but if you thread the screw in a bit sideways into the mount then it will work, once again be careful!