take a torch and heat the extractor. then take a punch and hammer and pit it a few times. the extractor will have to be red hot. wait for it to be cool to the touch. then try to remove it

 

Everything is good when you get it out and the threads are fine :-)

 

Oh yea you can say that again.

Dick

 

Try this - heat the extractor then touch a candle to the hot metal and let it melt, let cool a little, tap with a hammer and small punch in the direction to unscrew it [ccw]. Tom

 

Congrats on your good luck!!
Hope this does not happen to you again, but if it does, instead of an extractor, I would TRY A LEFT HANDED DRILL BIT of the about same dia. that you used as a pilot for the extractor. Obviously you need a reversable drill too. This has worked for me every time so far. Wish I knew about it years ago. Hate extractors. Break all the time.
The LH drill is the trick!! Had a couple of old timer machinists tell me about it. They say the direction combined with the heat and friction will remove the broken stud/bolt. Works well so far!!! Backs the little slobs right out of there.
Of course the LH drill won't work on a hardened steel extractor.
Industrial supply houses/catalogs have the LH bits. Won't find them at sears, lowes, or HD, etc.
Dremel with carbide or a diamond bit is about the only thing I can think of that will cut thru the extractor. You done good!!!

 

You can buy the left hand drill bits at northerntools.com.

 

Broken bolts/studs = my nightmare!