HI.. I WANTED TO REPLACE NIB ON SHEAFFER PEN WHICH IS A CARTRIDFE FILLER. I COULD NOT PUNCH IT FROM BEHIND THE SECTION DUE TO PLASTIC PIECE STICKING OUT WHICH PIERCES THE CARTRIDGE AND FEEDS INK. IS THERE A SOLUTION SINCE I WANTED TO CHANGE THE NIB. KINDLY ADVISE.
REGARDS.... PINNIRO