I'm an advanced novice from the old F1 days and bought the 3300 for my wife. Generally quite happy, and wanted to use external flash. I read previous posts with speed light vs YN flash units. She has the YN560 II unit and get acceptable results with unit on shoe. However, the onboard flash pops open each time though only partially and I'm worried about physical damage to it. Not worried about the YN, just the small pop-up unit getting scarred or electrically damaged because it doesn't stay shut when using YN on shoe. Any advice?