"Christopher Tidy" wrote in message
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That's my second-choice plan, if the welding goes wrong...
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Before you grind anything, perhaps a local Kunstler can use the base as the
pattern to cast a copy in aluminium. You might have to insert spacers where
the screws attach the motor to the base because shrinkage will make the
curve incorrect.

For example:
https://www.saymoretrophy.com/cast-bronze/