Hi, this is my first arducopter project.  I'm having a hard time finding the right instructions for the motors & propellers.  The holes on the bottom of the motor don't seem to match dimensions with the holes on the arms, so I'm unsure if I'm to drill them out or what.  Additionally the propeller seems to have a gap of approx 2mm when using the plastic washer, but fit snug if I don't use the plastic washer, or flip the metal.

Are there current instructions available for installing the motors & propellers?  I found this one but it sort of glossed over those parts.  If it seemed to fit right I wouldn't have questioned anything  :)