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Ian,
After over thirty-five years of aircraft experience your question about
checknuts seems simple yet it's not.  Months ago contributors talked about
doing away with lock washers.  This (sorta) fits in to that discussion.
Certainly, one would not dispense with the checknut on a control rod Heim
bearing and there may be ways to enhance this locking feature
experimentalist may take advantage of.
I have used two checknuts on occasion. Bend tab washers may be used. One may
be able to devise a safety wire lock.  Clearly, Locktite will help though I
would use the permanent stuff as it can all be defeated by a persistent
wrench.  To answer your question directly I would say mechanics simply apply
maximum torque between the rod end and its jam nut (because they cannot
alter the approved parts arrangement).  As you remarked, the rod will not
usually go anywhere even if both ends are loose.  Be sure to determine this
by seeing the threads are properly handed to prevent adjustment changes in
the loose condition or, worse, the rod end coming off.  Left and right
threaded Heim bearing rod ends are available for those who are after
perfection although that is a moot point unless the pp tube end is also
correct.
On our Lancair I have used the factory supplied parts, cleaning them well
and using Locktite.  I use German torque... "gootn tight", then apply
birdshit (torque seal) to mark the index.
Walter Dodson  IV-P 35-40%
1895740IA

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