1. Draw a line with a pencil using the 5th string as a guide. Draw the line using the inside edge of the string (that which is closest to the inside of the fingerboard.) This will be your vertical guide.
2. Measure .286 inches up from the fret you want (ie. .286 up from the 7th fret toward the direction of the 6th). This is about 1/3 of the way up from the fret; 1/4" would be .250". This will be your horizontal axis.
What you are experiencing can sometimes happen if your neck has gone through some shrinkage due to environmental conditions. It is a simple process to replace the tuner.
1. Remove the peg from the hole.
2. Cut a small round circle out of white paper.