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Location: Rochester, NY
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Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
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My understanding of how barrel adjusters change their "setting" has nothing to do with vibration or the cable/housing pressure pressing on the adjuster/caliper. It's from the housing having a rotating nature as one moves the housing's other end about, as in the section of housing between handlebars and the frame. With each swing of the handle bars the housing twists a bit. If the frame stop adjusters were not able to stay put (lock nuts or the part this thread started with) the adjuster will turn within it's threading.
Perhaps the best proof of this is back when 5mm SIS housing was the standard and one used the shiny metal housing end caps the housing strands would sometimes produce a clicking/ticking sound as they scraped against the end cap's interior when turning the bars. Andy
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AndrewRStewart