Ever tried to electrical gum before it. I find this very practical tool: This removes fine pencil lines (4B for me) without damaging the paper, which is nevertheless home entry. The gum is soft and crumbly but holding the camera merely rotate quickly itself. I have had so far no scratches or erosion (for conventional laser paper, graph paper schoolboy "distributor" or Clairefontaine), and the fact that it does not move the gum to move on so wants to erase avoids crease the paper when, like me, it gets excited after trait that does not fall properly. The gum is a good weight and a shape that fits comfortably in your hand, making it stable. It can take two ways: by pressing the button with the index finger or thumb.
The gums do not seem expensive, but I do not use it as much as a professional.