Hi
I picked up a banjo from a friend who's never really used it and I decided to have a go on it. I was restringing it and once I got the strings on, I noticed that they were touching the frets at the bridge end of the fretboard:

(excuse the cell phone pics)
Can this be adjusted with the truss rod? It seems like a lot to correct with the truss rod so I'm reluctant to give it a go without some advice. How does one do this on a banjo? Is the truss rod adjusted at the headstock end, or at the nut in the body (there are three, the long one in the middle and one up against eack side of the body)
Here's a pic of the insides:
Thanks