I bought a used Quattro off ebay it arrived today. I plugged in my Black Widow headphones and noticed the sound cutting in and out. I jiggled the plug and it feels like it isn't going in all the way. I looked in the hole expecting to find some little piece of crud or whatever in the way. There was nothing but there was a mark on the bottom of the hole where plainly the previous jack had been rubbing. It appears the hole isn't deep enough. Could be the reason I got such a good deal on it. Anyone else with this problem? I am thinking about drilling a pinch deeper to relieve it and see what happens.