When you tackle this be very patient. I had to do this on my 61 and it was a pain in the butt. Take your time and try to have a friend with small hands come over I could barely fit my paws up into the space to mess with the top screw.
"Never tell people how to do things. Tell them what to do and they will surprise you with their ingenuity." - George S. Patton
I could barely fit my paws up into the space to mess with the top screw.