If I understand your question correctly (once you get the kit you'll see
clearly), you simply turn the tangents to hit the string in the proper place to
produce the note you want. The tangents should be adjustable (turnable) so
that they can swivel side to side and allow you to change the pitch.
The steps to tuning properly are to tune the string to the desired note
(probably G in your case). Then with the octave key tangent 90 degrees to the
string (that would be key 7 from the head of the instrument with the tangent
hitting the string straight on) check the tuning for the octave. If the note
is
dead on tune the rest of the tangents according to the note. If the octave
note is off adjust the nut and retune the open string then check the octave
again. Repeat as necessary. Remember to push on the string about the same
strength that you would during play during tuning.
By moving the nut you are shortening or lengthening the string sometimes by
only a millimeter. The octave tangent should hit the string at exactly half
the length of the string which gives you a good base to tune the rest of the
tangents from. Note: some kits and instruments don't have a nut (no jokes Roy).
I am only surmising that this is the answer that you are asking for. Hope it
helps and thanks to all those that helped me learn so that I can ramble to
others.
Scott