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I have a old metal garden sprinkler with severalhttps://carnot.physics.buffalo.edu/mailman/listinfo/phys-l
parts. I am trying to
unscrew the base, but it is stuck. Maybe rust or
other particles have made
the screw threads very tight. Does anyone know of a
liquid/chemical that
might dissolve the rust/particles and loosen the
opening to free these two
pieces? I have tried WD-40. Also used vinegar. No
luck. I might need a
stronger acid, but I obviously don't want to
dissolve the metal too much!
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