I got an old pentium 133 computer for free. I also happened to get a free 166 mhz pentium. I'm trying to replace the 133 with the 166 mhz chip, but I can't figure out how to take off the 133. I lift the bar thing, but nothing happens. There's this strip of metal that keeps the heatsink strapped to the motherboard. Anyone have any ideas? I'd still like the 133 to be OK in case the 166 doesn't work, so I can't just chop it off 