I took a piece of scrap 3/4" plywood,about 12"X 18" or so,cut a 2" strip off the long side & laid it on top of the larger piece along the back edge creating a backstop.(picture a counter top with a short splash back).Keeping the strip square to the top,I shot three or four drywall screws thru it to attatch it to the top.To apply the wraps,lay one down on the 'counter top',up against the 'splash back'& even with the edge (left or Right),place the shaft up against the splash back & roll!I did put a soft mouse pad on the 'counter top',as well.It's easier to build & use,than to explain it!