I'm adding a 3"x3" access panel to my Gee Bee R1. I hinged it at the top with pinned nylon hinges.

My question is how to secure it? I've looked at various latches and methods of keeping it closed, but nothing seems to do the job without spoiling the scale appearance.

Does anyone have a technique for making a blind latch that can be unlocked by pushing something through a small hole?

Or how about something that can be given a quarter turn to release?

Any ideas will be appreciated.