"Bil" wrote in message
...
How can I remove the stub of a pencil zinc from its bronze anode
holder?

The pencil zinc screws into the anode holder. But the loss of zinc
from the anode means that I cannot get a mechanical grip on it to
unscrew it.

Cheers and thanks for ideas

Try a 'broken tap extractor' but if all else fails drop the whole thing in
some battery acid until all the zince has gone