In reply to Ken Neff concdeerning the broken screw extractor.
About 10 years ago I had a similar experience on a '65 TR4A. I broke off a
stud on the head, tried to use a product called a n "easy-out" or screw
extractor and broke it off. I took the head to a machine shop and
they told me to go and buy another head! I had a guy come over to the house
with a torch and try to loosen it to no avail. A few days later on the way home
from work I remembered a professor saying that if you want to do some
good grinding you needed a good impedance match. That is your work piece
should be as hard as your grinding tool. I went to a hardware store and
bought about 6 small grinding stones like the ones which fit in a Dremel tool.
Those stoneshe dremel tool ( a high speed rotary grinder) really ate through
the
screw extractor. (I think I used most of the 6 grinding stones.) After I
got the "easy-out" out, I drilled out the stud , tapped it and put in a
threaded stud. 'Worked like a charm. The 6 grinding stones cost about
$2 - $3 each which was less expensive than a new head! Good luck -
There is another alternative. There is a process of "electron discharge"
machining (don't remember the actual name), but it can perform miracles
in the above-like case. It is also a lot more expensive than, e.g., a
handful of dremel bits, but can remove the broken extractor 100% while
taking 0% of the head (or broken stud). By extension, it can take 100%
of the broken stud and 0% of the head. Unfortunately, it has been [way
too many] years since I remember reading about it, but maybe a good ma-
chine shop could tell you [or someone else on this net?]. It may or may
not be cheaper than a new head...did you try penetrating oil (like Li-
quid Wrench?)?
-RDH
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