I don't ever use Skype, so thats probably not the best way to get in contact with me. And I apologize if the rules are not as concise as they could be.
This case in particular, it would seem that an entire block of text didn't get transferred from my local copy to the online copy. I'm actually quite glad that someone else is reading the rules and finding these mistakes, because I've gone almost a full year without catching that one.
The hit location is determined by the attacker spending margin of success to hit. Because margin of success can be used after the attack has been made, the attacker can choose any hit location that they have enough MoS to reach.
Here are the rules that should have been in the document, but I neglected to copy/paste:
If an attacker deals a wound with a called shot, the wound is applied to called location, and causes the appropriate penalties. If no special location is called, use the generic wound penalty...
... Characters may choose to attack specific locations on a target by spending margin of success. In general, the smaller the location, the more margin of success is needed.
• 10 = Non-Vitals (Legs, Tail, etc.)
• 15 = Semi-Vitals (Face, Neck, etc.)
• 20 = Vital Spot (Brain, Eye, etc.)
+5 bonus if declared in advance
If a character makes a called shot on a location that isn’t covered by armor, the shot may bypass the opponent’s armor entirely. Each piece of armor has a coverage rating that determines how much margin of success is needed on a called shot to bypass it. (Generally between 10 and 25)
Margin of Success is the number that you exceed the target number by. So, if you had a target with a Dodge of 10, and you managed to roll a 25, you would have 15 Margin of Success. There are some perks out there that will reduce the amount of Margin of Success needed for certain special attacks, like Called Shot.