I don't recall any seals at the top adjustment nut so not sure there is an "easy" fix.
I have seen/read some online post about using O rings and/or Teflon tape?
Some have mentioned success with just re-tightening the nut.
(Being VERY careful not to change the location of the screw)
or at the least be sure to record the number of turns in or out if you do so.
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When I die, I want to go peacefully like my grandfather did, in his sleep.
Not screaming like the passengers in his car. 
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