Does anyone have any suggestions for the best setting, and how to measure, the neck setting on the ES-339? I bought it new and it was essentially flat, so I had to back off the truss rod nut a little every few days until I got some daylight under the strings. I am currently measuring the gap at the 9th fret, while keeping the string held down at the 1st and 14th. This is how it is written in the Gibson Les Paul manual. But there is no such truss rod adjustment advice in the Epiphone ES-339 manual.