I'm going about replacing all the seals and wear ring in my pump assembly today. I got it all loose from the back (the engine is out) , and pulled the drive shaft. What do I need to do to get the entire assembly off? i have pryed on it some, but do not want to damage anything with brute force. Also, when i get it apart how do I "pop the snap ring on driveshaft, at carbon ring area (behind the steel collar), and "lap" the collar.?