I've never been one to hang onto old rubbish, ok that's a lie. If it might come in useful one day, it stays... forever.
But the old portable compressor has been sooooo useful over the years, and I didn't really want to buy another, not yet. It was working its heart out the other day while I was blowing water and dust of my deck, when its tone changed, and not for the better I can tell you!
Had the head gasket blown? Filter blocked? Piston holed?
Ten minutes later the head was off. I'd actually never looked inside one of these before and was surprised at the valve set up. Just a couple of sprung steel strips, and one of them had worn thin and snapped. Apparently a common fault.