Well, the hub closes fine without the pins, but the pins seem to be a bit swollen. It took us some time to find the mechanic for the bearings and I cleaned all the oil from the pins, and I guess I should not have done it. Maybe the plastic is swollen because of the immense humidity in the shed, so it will not fit anymore. We could try riding with just 6 pins, but it wouldnt be smart to do. I would like to know the exact measures to be sure if the pins just need a bit more force to close, or are they really toast.