Stuck oxygen sensor

[William Magliocco]

Even using plenty of "blaster" pentrating oil, I have
done a nice job of rounding the edges of the 7/8" nut
(or metric equivalent) on one of the oxygen sensors on
my new V6 toy.  Was using one of those specially made
deep "oxygen sensor" sockets that is partially cut
away  (where the wires go).

Am afraid to cut the wires off the end and get a
standard deep socket, because I may not succeed.

Any ideas from the gallery?  Cold engine or hot? 
Apply heat to the sensor...whatever?

TIA,  Bill

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