l am putting on a new Sparx rotor on my '67 T100 . Do l need to do anything to prepare the rotor or the spindle. do l need any kind of loctite or does it need to be reamed. Is it just a straight slip on with woodruf key and nut tightened down. Also it says you should have .20 clearance but at present its only .15 , is it critical. l thank you for any advise.