I have salvaged a few "OOPS" situations with broken taps with a variable speed Dremel tool and this type of diamond burr, but it's a S-- - -L- - - - -O- - - -W process. Be very patient so you don't make things a lot worse. Good luck!

www.ebay.com/itm/404420961535?

Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!