Instead of putting the pin in the centre of the hinge, you can also use a red colored pencil and draw a line on it, this way you can visualize where the hinge is at. I have always been wary of putting a hole in a CA hinge.

Also check this for a RC Universe 'How-To' column on CA hinges:

http://www.rcuniverse.com/reviews.ph...ew&reviewid=55