Yes that is a real problem. The sony light wedge fits the 505 like a glove but there is nothing to hold it down. So opening the light wedge case the wrong way will cause the wedge to move across the 505 buttons and scratch. Since the lens side of the wedge scratch pretty easily.
What I have done is to put a rubber band on the wedge and 505 to fixate them together. Since doing so I've not scratched the lens any further.
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