This is what I used when the same thing happened to me.
Luckily for me, I had the cylinder head on the bench, which made it tad easier to access it.
https://www.ebay.com.au/itm/6mm-Dia-...4383.l4275.c10
You can buy those diamond tipped hole saw bits from a Tool shop. Just get the size you need to cut through the stud.
If you're careful enough, you can pretty much end up not having to tap the hole to the next size, but use the same size tap
to clean the slightly damaged thread.
I have a kit of the above diamond tip hole saw bits in case it happens again.![]()




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