Thanks - here's an article that explains a little more what I was on about http://www.instructables.com/id/When-a-Phillips-is-not-a-Phillips/step10/ - according to a few sources I've encountered, many Japanese models and toys use the JIS rather than Phillips standard. If you use a phillips with a JIS screw, you are more likely to strip it because it won't fit correctly because it's a bit to pointy. If you use a JIS screwdriver with a phillips, then you won't run that risk as it doesn't have the point.