Hi, I've been refinishing floors off and on for a few years now and most of the time for the field I rented an EZ-8 Clarke drum sander. I recently purchased one used and for some reason after the fourth or fifth length of flooring I go down the paper roll I'm using starts to drift to the left of the machine and pulls itself off center. I have to stop the machine and re-center the paper on the drum. I've never had to do this on any machine I've used before. Is there some adjustment I'm missing? Or are the drum's fingers not holding the paper properly and it needs to be replaced? If it's the latter does anyone know a quick fix to get me through the next couple months so I can get up some money to buy a new one? Thanks for the help.