When installing the bearings and spacers, it is important to install the rotor side bearing first, pushed right up to the shoulder… insert the long spacer, then install the sprocket side bearing… however, it is important to note, that the sprocket side bearing (not the sprocket carrier bearing), does not go right up against the shoulder… if you push the bearing in too hard, the bearing will seize and most likely collapse… I have made a special bearing installer for the rear wheel that only allows the bearing to be pushed in the exact amount and no more… the bearing just has to touch the spacer and there will be a small gap between the bearing and the shoulder… I have also made my own wheel spacers out of stainless steel with a smaller outside diameter… if you have a brand new spacer and seal, it is very difficult to spin the seal on the spacer, and if you look at the old spacer, it will have grooves all around, showing just how tight the seal is on the spacer… I made the new spacers with approximately 0.5mm smaller diameter, and still grabs the seal perfectly… the new spacers will last the left time of the bike, and the wheel spins a lot easier with less stiction on the seal… I don’t have pics yet, but they look really good… they are double the weight of the OEM spacer, but that shouldn’t matter at all…