**** **** **** **** I spoke too soon. Yesterday i had removed 5 of the stuck ones.
Today I worked on the last 2, and on the final one only half a glow plug came out
I thought this tool was going to prevent this, but still one gp ended up in the head.
I had the tool on right and did not wiggle or push it either direction, i was just turning with a wrench and i heard a crack noise, then the tool spun much easier.
I felt in the threads with a little screwdriver and i can feel the tip stuck there.
Oh well, now time to find an injector socket and get the chunk out.