hi and how are you? i am a big problem and i need help, guide and instruction. i took out my trailer hub, took out grease seal, bearing and clean up the hub. put back new seal, new bearing and grease it very well. before i put the seal on i tried it and goes in and sit just fine, when i put the grease seal on and put a wood ontop and hit the wood for the seal to go into the hub. seal went in and sit fine and look flush with the hub. i went back to put the hub onto the spindle , it start going in and stops. i tried to play around with it while pushing it to go in but it did not . what is the problem and what have i dont wrong and how can i fix or correction this situation. thanks