One is left in standard EADGBE and the other down a half step in EbAbDbGbBbEb for the songs that require it. G'n R - Sweet Child etc. Don't tune 1/2 step down, that's ludicrous. Just keep the same tuning. Drop D: takes about 15 seconds. If you put the strings on right, you will never need a locking nut. Never needed it, never will.