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Not sure why this is posted, but as an amateur aircraft builder, I have a love hate relationship with these things. On one hand, they're clearly very versatile and cheap. On the other, if there's a significant curve in where they're installed, it can be incredibly frustrating to get the pins in/out.

In some cases, we'll take the kit-provided hinge and put them aside. Instead, we'll use SkyBolt camloc-style fastners.

Unlike the author, I _have_ had one of these vibrate its way out in flight. It was a small door that had a fastener on the other end, so it didn't completely detach from the airplane, but it was noisy and somewhat frightening at first.

Please secure your piano hinge wires. :)

The cowling on my Lancair 360 uses these and I absolutely love them, I’d like them on my next aerobatic plane, but not sure we’ll be able to make that happen.

My T-18 used them as well, in the ailerons and on the horizontal tail.

Edit: the aluminum variety. That link takes me back to years of EAA membership, and flying my T-18 to the annual Rockford flyin (before they moved to Oskosh)

Aircraft Building – The Installation and Use of Piano Hinges (1985)