A few years ago this question was asked so often that I did a "How-To" with illustrations on the proper way to install CA hinges.

Give it a look, it's short and to the point!

[link=http://www.rcuniverse.com/magazine/article_display.cfm?article_id=55]Installing CA Hinges[/link]

PS, if your hinges have the slot, you don't need to drill the hole, but you should still add CA (THIN ONLY) to both sides