I know what you are saying. What I had in mind when saying what I said is that there must be some forces "tugging" on the unit as pad is being "spun" around, and bigger the pad bigger the forces will be (not just because of increased weight, but also because of increased distance from the center). How much increased they are and how much they matter I do not know but I felt they might matter so I felt one should warn they might matter as they might be putting load and at certain point that load might become too much. Unless, of course, increase in friction (of bigger pad against surface) compensates for increase of "tugging" forces. But if it does that would still mean unit is working harder than it should to get that pad moving? Isn't that why smaller pads end up easier on tools load wise?Wet a 7.5" pad and press it onto a piece of paper and then measure the wet spot. I'll wait........![]()