It builds soul matey, keep going.........

It's part of LR ownership ;~)

I often wondered how they did this without pulling the head. Apparently you
get the piston almost to the top of it's stroke, fill with grease... drill
thread tap new , insert Helicoil, snap tang, recover from grease, turn
engine such that swarf ejects with grease through plug hole, clear out the
remaining grease, voila.

I was impressed anyway.

Let Si's post be a lesson to any one who thinks that any old socket will do
to remove/insert the plugs. Most are too fat and cause these Issues. Bet
there aren't many V8's without Helicoils in.

Lee D