How you might ask?
With a lot of MAPP gas and an impact wrench cranked to 11.
When my dad got home today he remembered he had a canister of MAPP gas in the back of his workbench.
After ten minutes straight of MAPP gas torch on each one they came right off. Those bastards were toasty when they hit the floor though.
Went out for a test drive and burned off all the WD40 and PB, it was real smokey for a bit.