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Use a flap wheel in a die grinder



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You can do more harm than good



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You should be able to rent one...Just use your own judgement/patience/be conservative



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Do not use a ridge reamer



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Make sure you follow the directions for your reamer and they'll work as intended.



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There are just too many ways to screw up a block with a ridge reamer



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Ridge Reamer should be called "block screwing up machine"



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Any ridge that too deep to cleanup with a hone job, likely needs an overbore anyhow



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SAME ONE I USED AND RUINED MY BLOCK



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I've always used it