I am looking into my pup's bearings for the first time. I have a 2002 Coleman SantaFe 10-foot with 7" e-brakes. The inner seal appears to be about 1.5" ID, 2.05" OD; the spindle is 1". According to ColemanPopUpParts, Coleman used a 1" spindle with 2"OD seal and 7" brakes on its smallest pups, and nothing else on the pup has been replaced, so I think it's the stock axle. When I pulled-off the castle nut, I did not find any washer between the castlenut and the outer bearing. My first thought was that there is always either a D-washer or a washer with a metal tab that fits into a cutout groove on the spindle. But, looking at my spindle, it is clean threading with just the hole for the cotter pin. There is no cutout/groove, so a plain washer with 1" ID would fit, but a D-washer would not fit. So, as I think about it, I'm not sure what a plain washer would really accomplish: it would rotate freely around the axle. Maybe there is supposed to be no washer under this castle nut?