[JET]

Originally Posted by TkrPerformance

the only way to get a broken tap out is to brake it apart chisel and hammer or diamond bits to grind it out. done it a lot of times both ways to fix turbo housings for guys

Yep, exactly right. I have a set of core pins I use for breaking them out (punch press pins). They do make diamond bits you can use in a die grinder that will work. The biggest issue there is not messing up the threads that are in there already too badly. I would try breaking it out first. Big whacks since the tap is strong but brittle.