Even I cringed reading this news. Could happen to any of us at anytime. I
once had the oil sender hole strip on a 1.9. Never did get a good helicoil
installed.Took lots of looking to find a 10mm 1.0 thread pitch coil. Still,
the fragments were all over the place,and maybe inside. too.Good fragnment
removel is vital! Go in a tad with the tap,than retreat and vaccum.Then go
again a tad and vaccum. Put oil on the tap that you use so the fragments
will stick to it, instead of dropping inside the engine.  I used a brass
pipe driven in, and then jb weld placed around it. Screwed the sender into
that. Worked good.