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Yep it works using an older Silver coin

Hint : A Key a simple house key at the back end also can work, and they are lighter with the cutouts and cheaper.. many are actually Nickel Silver

Jerry before you make a new one

Put this one together using the Microbolts you should have on the bench :)

Rub the Wedge end vigorously on an old wash cloth, there should be enough give ...

Normal polishes actually will dull the lead :(

Try High Grit sandpaper or simply a Cotton Cloth :)