Alison,
 
   Most older HGs are tied back with wire or gut to the tail piece. This keeps it from moving quite well. I replaced the gut on one of mine with wire and now it doesn't budge at all.
  It sounds like the plastic nut that you are talking about is stripped out and is allowing the adjuster to slip back through the threads. Just guessing as I have no real idea what the whole system is but usually if it is slipping back in a situation like this the plastic has given out.
 
   Hope you get the problem worked out,
 
   Scott

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