Digital BW, The Print

Testing a cut-down photo rag roll in the 1160 piezo and needed 
to interrupt the first print. I made two mistakes: in pre-feeding the 
paper, so it fed to the second "sheet" of the panorama, and not 
centreing the image.

Now I can't get the roll out to rewind. Is there any way to manually 
reverse the paper or unlock the feed rollers?

Otherwise, switching it off feeds the entire 12m roll before it 
stops (I pulled the plug)