I have a fairly recent 17" MBP and I've discovered today that the headphone socket is a bit looser than I'm used to. My usual headphones click in as usual, but very little effort is required to pull them out. I have recently been using a client's cable to hook my MBP up to their speakers, and I have a feeling that the 3.5mm jack (which was a fairly tight fit) has somehow worn the socket. Is it possible that using a slightly 'fatter' jack can damage a socket like that? I'm a bit wary of people plugging their cables into my laptop now, as I don't want to exacerbate the problem! Anyone else experienced this?