Still working the problem. Heated it up again, more PB Blaster, cooled it, tried to turn with a vise grips. No luck - wouldn't budge. Have totally buggered up the threads on the shaft. Before doing this, tried to fit an extraction tool on the protruding part. Not enough length to make the connection. Next step - drilling it for a bolt extractor tool. Going out to buy left hand drill bits.
