I would keep trying heat and soaking with penetrating oil. I don't know if the Dewalt 1/4 inch impact driver I have will fit thru the opening, but that might get it loose by alternating tightening a touch and then loosening with the impact driver.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.