You would probably want to braze in a replacement piece.
How do you convert a flat belt drive to a v belt drive? Get a v belt pully for the electric motor and place the v belt on the flat belt pully.
Unless this is a type that uses belt slip as the speed control mechanism then you need a flat belt pully for your electric motor and rig the treadle to take up slack with the new power source location in mind.
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Thomas
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