Rust is generally nasty stuff. Not only has the parent metal been eroded,
rust is very abrasive, and it takes up more room than the parent metal. So you
end up with the threads wedged tightly with grinding powder. Most always
fasteners requiring "heroic measures" will fit looser than original and
sometimes
will be beyond reusing. Fortunately, most times this looser fit isn't a
problem. When it is several methods, like your suggestion, are available. The
first step in doing the repair is to get the silly thing apart in the first
place with a minimum of damage.
keith
In a message dated 7/27/2008 6:16:28 P.M. Pacific Daylight Time,
aultgc@att.net writes:
I mean no criticism of Keith's advice. But, please remember that iron
oxide -- rust -- is much harder than steel. So, rust flakes mixed among the
threads tend to "screw" things up mightily by cutting new threads in a form
one does not want. If one is lucky, one gets the bolt or screw out without
breaking it off, and has enough base material left in the captive threads to
re-tap and use the next larger fastener.
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