Hello there, i recently installed new mighty mite machine heads and a new bridge and as i re-strung my bass today, i realized that the open E and A rattled alot and i could not make the note sound on the first fret of the A string. I noticed that the strings near the first fret were really low and i tried raising the action but nothing happens. I think it is in need of a truss rod adjustment because i did hammer in one machine head (yeah i know it was a bad idea) and i'm guessing that might have messed with the truss rod and caused the strings to be so close to the first fret. I don't think it is the nut because i had other machine heads installed with the same nut and they were fine. I also noticed that my E string is not in the middle of the two poles on the pickups. I was wondering on how i can fix this? Thank You much appreciated.