Dunno if you guys saw this from Ed's Facebook Page, could it be he actually posted this? The "EVH" at the end seems to indicate so....
In answer to the Wolfgang guitar questions posted - “Why locking nuts on a stop tail piece guitar?” and “Why do you put a locknut on a hard tail?"
It's for maximum tuning stability! It will not allow the string to slip out of tune at the nut and if the guitar goes slightly out of tune, you use the fine tuners behind the bridge. It's a much more refined and precise way of tuning. EVH