Hi Donna, I am really sorry you are not happy with the 5F blade. This is most unusual and very disappointing, it sounds like it might be running too dry or has been over tensioned. I wil happily replace it for you for a new one and arrange to get this one back or I can have it back for a full refund. We never leave people stranded with clippers or blades that they are not happy with. If you let me know how you would like to proceed I can sort this out for you. Kind Regards Susie