I AM TRYING TO FIGURE OUT HOW TO REMOVE MY OLD SNAP AND ROLLS ON A JOHN DEERE 843 CORN HEAD TO REPLACE?

I AM TRYING TO FIGURE OUT HOW TO REMOVE MY OLD SNAP AND ROLLS ON A JOHN DEERE 843 CORN HEAD TO REPLACE THE WITH THE NEW ONES BUT FOR SOME REASON ITS TAKING ME FOREVER TO REMOVE THEM IT TOOK A DAY JUST TO GET ONE OFF CAN SOMEONE HELP ME I AM DEF DOING SOMETHING WRONG I HAVE ALL THE BOLTS AND ROLL PINS OUT AND I BEEN BEATING THE HELL OUT IF WITH A 2LBS SLEDGE AND A PRY PAR AND ITS DEF NOT WORKING CAN SOMEONE PLEASE HELP ME OUT HERE