I am thinking opposite on removing the remains of the glow plug tip. Keep in mind that cylinder pressure will want to force the remaining GP tip AWAY from the prechamber, not into it. Having the back of it slathered with jb weld and maybe some kind of metal taking up the space between the jb weld and the plug, should keep the tip from moving. No matter how much heat or pressure it sees, it can't go anywhere. I think that any more effort to remove the remaining GP tip will result in the head NOT being able to be patched, and the car not drivable. Even if the tip were to somehow get into the prechamber, it will not go any further. It can't get into the combustion chamber (too big).

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All Diesel Fleet
1985 R107 300SLD TURBODIESEL
2005 E320 CDI (daily)

LOTS of parts for sale!


EGR block kit
http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html

1985 CA emissions 617 owners- You Need This!
Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst.

Sanden Instalation Guide (post 11):
http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html