Man did you get me thinking about this, "Real pros" don't do this. Wow that was a zinger to push me off the plate. LOL I walked away going holy crap I'm a "real pro" why would I be doing this? Then I got to thinking about WHEN I will do it and when will I recommend it, it's simple, I do it or recommend it when it is TOO LATE to bend the hinge! If you are assembling a new hood that has been painted and you are working on a late model car where you try to bend something and it folds the hood in half, you shim it instead.
I put one on the trunk lid of my Gran Sport, why, because it was all painted and new rubber in and I wanted to bring the back down a little without damaging the body and paint that I had FINALLY gotten done.
Geeeez now I can get back to work.