New pressure plate 
  Im getting a dp pressure plate +cover off a member and I think it will come with a new bearing?
 
 Im most worried about when I pull off the old one as to whether the push rod should come out?  or am i better of knocking the rod out of the old one so the rod stays in?
 
 As I heard if the rod is pulled out o-rings can be torn?
 
 Many thanks