"George" wrote in message
...
Just for completeness:

As noted, after much effort, I did get the rod out. Next time, I'll get
an impact wrench. I put a new (aluminum) rod in. I flushed the tank
several times, including 2x with vinegar. One thing I found is that it
flushes much more 'powerfully' if I remove the draincock.

No need for an impact wrench if you wrapped the threads with Teflon tape. It
still provides protection, can check continuity with a meter if you like.