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It was an electric shaver with a shaving head which wouldn't stay down. As a quick fix the user had taped it down with sellotape and had been using it like that for a considerable time. He took the sellotape off and I examined it closely with a magnifying glass (essential these days as my eyes no longer focus as close as they used to). It appeared that a small piece of plastic comprising the catch had popped out of the slot it was meant to locate it. With a bit of gentle easing I managed to pop it back into its rightful place, at which it functioned perfectly, holding the shaver head down but allowing it to be released for cleaning as designed.