Worse than breaking one is just bending it...then you're tempted to try to straighten it, and then it snaps off flush, so then you try to run it as is, and of course it vibrates out of position, which you try to prevent by boogering up the threads at the broken edge, which doesn't work, but jams the remnant hopelessly in the backplate, which means you've trashed one of your last metal backplates...not that I've ever done this myself, nosirreee...