[TowerTalk] Pier pin base

[Arliss]

I'm going to put up a 190' Rohn 55 tower where another tower once stood. 
  While I could dig out the old base and pour a fresh one, I thought it 
would be easier to go the pier pin route.  Although I've had a number of 
towers up over the years, I'm not experienced with erecting a tower on a 
pier pin.  Do I need a tapered base section ($$) to do this right?

Thanks.

73,  Arliss  W7XU