There seems to be a theory that exists with little evidence to back it up apart from a little name dropping.
Unless someone can quantify this alleged damage re ultrasonic induced weld fractures and an undefined non strip-able mod
it would seem that the 'theory' is just
p*ssing in the wind.
Please cite a
proven ultrasonically induced fatigue fracture on a
moderator including mod material, power, frequency, immersion time, temperature, weld cross sections, weld inclusions, x-ray, type of weld and cleaning solvent.
Using the politically correct 'precautionary principle' as a counter argument to hide behind is
NOT ACCEPTABLE in any form.
Let us decide this question on
proven facts and evidence alone before giving advise, not "I think...."
Too many myth proponents around.
As to the WD40, IMHO it would seem to turn hygroscopic after a couple of weeks, never use the stuff any more. Better to fully dry and use a propriety gun oil.
BTW in my trade I love WD40, brings me loads of repair work!!!!