hi, i found this really crapped up bass at the flea market for $40. it's a mexican fender precision and it looks like it's been through hell. i bought it so i can have something to do during the summer. like fixing things and 'customizing' it. but it's a 5 string and for what i play, i don't NEED the B. can i just not put on the B string and play it as a 4 string? will that set off the truss rod? or the pickups?