Originally Posted by River
How does one diagnose a high first fret? The rocking test doesn't work up there.
Have you tried a shorter straight-edge? One about 4" should do. And a set of feeler gauges. If you put the 4" straightedge on the first fret and on the third fret (for example) and check to see if you can get a feeler gauge under the straight edge at the 2nd fret, you have either a high first fret or a low 2nd fret.