If you have an air compressor and an air hammer, try to find an attachment
called a blaster. They come with 3/8 and 1/2 drive ends, in the center is
a wrench surface for a 3/4" wrench. The vibration breaks it loose. Use 6
impact quality sockets. You could make one out of a old air chisel, grind
and file the
chisel end into a square, and substitute vise grips for the wrench. You
can try using a breaker bar, and applying pressure rap the end over the
socket with a hammer.
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