Finally had a chance today to remove the head and go for the
suggested options but the 3mm was with thread was all rusted out
so i went straight to welding.
Covered the engine up and used a small steel plate with a hole to go
over the stud then got my trusty Cig/tig welder out and plenty of goes
and failures of nuts coming apart as I tried to torue them off the last
one worked. Phew!! major drama saved. Now to put in the late studs.

Attach file:

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  head stud fix.JPG (69.39 KB)