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I decided that Delrin would be a good choice for the valve seal material since the old seal seemed to be made of hard plastic.
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Drilling.
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I ground a sharp tool with lots of positive rake and a flat face, set it to the proper angle with an angle gage.
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One cut.
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The other.
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Parted off, compared to the old seal.
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The exhaust valve reassembled. You can see my precision drawing underneath.
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