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I am in the middle of changing out the water pump on a Yamaha F-225 and can't get the woodruff key out. I have read the posts about using the Dremel and may give that a try next. I have also seen recommnedations of using a chisel to drive it out. My question is how hard can you hit the key with a hammer and screw driver or chisel without worrying about doing collateral damage. Can you give it a good whack or do you need to just tap llightly?