Notice that hole in the middle? Guess what it does. I use the term guess for those that do not have a clue. If you know, move to the front of the class and get your $1000.00 bonus. That is how much you will save by making sure the grit, metal shavings, gasket material and feathers are not there. This hole feeds oil to the front bearing, locknut oil slinger and seal. It needs to be perfectly clean
