After many years (at least 16 years) and countless primer tube changes the two cap screws that hold down the primer tube feeder have bowed out the housing causing my primer bars to stick while feeding.When you tighten the cap screws down you are pulling steel inserts down in the body of the primer tube feeder.You can't see them in there till they start to come down from repeated use.This will cause the bracket that holds the primer tube to get two bulges where the inserts are and starts to drag on the primer bars.I carefully filed the bracket flat again so I can use the machine but a new one is the answer.Called Dillon and they are sending me a new one no problem.I guess their lifetime no BS warranty is true.I'm surprised they still had me in their computer after all these years!Happy camper here 
