FILM ROLLER KEY ON MY MAGAZINE 500 CM

[drjjpdc]

I've had Rotator cuff surgery so I put my Hasselblad 500 CM in my closet. I was starting to feel better and wanted to take some photos. Everything works on it except the film roll holder key on the magazine won't turn. I can't load a roll of film in it. Please tell me it's something simple.

John