Had the same issue -- I assume you are talking about the difficulty of rotating the pad onto the sander, as opposed to depressing the green button to lock the spindle (which can also be difficult at first). When I first encountered this problem, I brought it over to the dealer, as I was completely unable to get another pad on. He didn't have any immediate solutions, but after staring at it for a while, I suggested that maybe we could slightly loosen the hex bolt in the center of the spindle. After we did this, the pad went on no problem.