Vitos Degree key

So I was going through the bag of hardware that came with my last blaster purchase trying to find that little bb that goes between the clutch push rods (which I did find:)) and I came across a woodruff key with a slight notch on one side. I think it is a vitos degree key to advance the timing. My question is: Is the key worth the gram of steel it's made of or would it be a waste of time to put on? Second: Does the key normally only have a notch on one side?
 
Vito's gave me one for free.. i say worth putting it in if u didnt already do the advanced timing mod. the package says it supposedly adds 2-3hp. and yes it is supposed to have a notch, thats what offsets the timing
 
here are a couple pics but there not very good. the drawing is of the profile of the key, Crude but it gets the point across.
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