In 1959 at the age of 5 i watched my father sharpen a chisel. he used a grinder with a similar motor and a new, oil packed wheel. When he touched the chisel to it the wheel exploded with the largest piece hitting him between the eyes. I thought he was dead.
We spent the afternoon making a good guard for it. When I asked him about what he planned to do he told me it wasn't as important.
If you do this make twice the guard you think you will need.

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Front sight and squeeze