Digital BW, The Print

One of the paper rollers on my 1160 - part of the long line that sits just
behind the print head as it moves back and forth - seems to have taken to
sticking out ever so slightly more than the rest.

When it does this it seems to catch the print head very slightly and attract
some ink which it then deposits via the roller on the paper...

any ideas of a fix to get it to sit "back in line"?

tim