I am changing out my stock drivers with a different pitch and some anti rachets. what is the best way to get the old drivers off and the new ones on? Just from putting the new ones on the end of the shaft it looks like they are pretty tight going on there. Also what is the best way to figure out how far to put the first driver on? my thought was to mark the edge of the stock one with marker on the shaft. If anyone has a better way let me know.