okay i had never heard of the fingernail thing. that sounds awful. I wonder if later designs helped? My immediate thought is: fill those finger spaces with clay

okay i had never heard of the fingernail thing. that sounds awful. I wonder if later designs helped? My immediate thought is: fill those finger spaces with clay like material -- to spread the load across the whole surface of the finger, not just the nail.. but yowtch. glad I never chose that career.