Originally Posted by TomJ

Just hold that big, flat, thin, hexagonal nut looking thing (valve keeper on top of spring) with an adjustable wrench (or some vicegrips if nothing else) if you don't have the Hazet tool right there with you. Try not to scar up that nut, it just needs to be held while you loosen the bottom 14mm nut. Don't tell anyone I said to use vicegrips instead of waiting a few weeks for the correct specialty tool to come in...