hi a glo n/v is a tappered needle and seat design-so never turn it hard the last turn in- do it ever so slow and gentlyhave you ever taken the time to study the nv tapper with a loop (jewelers glass ) you will be amazed at how rough some areyou can use 600 emory to polish them you will experience a new smoothness to the engines performance- this applies to the top end nv mostlynot all nv from the same manufacturer are created equally-so find a good one-if you jam your nv into its seat you will create a ridge in it that will reduce its performance-the glo fuel flows over
whenever you choose to remove a nvalways turn it intothe seat -count the revolutions- you can now return it to the place it was-were the engine was running as it s/b- you do not have to go through the whole tune up process again -that can be a bit timely- mark the nv -so you always know its location-with a dremel-or install a marker-i use old allen keys on my OSengines-hope this helps some a bit REGARDS TONY